CVE-2026-21643: 심각한 FortiClient EMS 취약점, 인증되지 않은 원격 코드 실행 가능

Daryna Olyniychuk 탐지 시장 분석가

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최근 우리 보도의 FortiOS SSO 제로데이 공격 이후로 (CVE-2026-24858), 방어자들은 Fortinet 생태계에서 또 다른 긴급 패치 우선순위에 직면하고 있습니다. 2월 6일, Fortinet은 원격으로 발생할 수 있으며 인증을 요구하지 않는 치명적인 SQL 인젝션 취약점에 대한 수정을 발표했습니다. 이는 비인가 코드 실행이나 명령 실행으로 이어질 수 있습니다.

현재까지 야생에서의 악용 흔적은 없지만, CVE-2026-21643는 SQL 인젝션이 가장 위험한 웹 취약성 중 하나로 여겨져 즉각적인 주의와 패치가 필요합니다. OWASP Top 10 2025 에서는 인젝션을 62,445개의 알려진 CVE와 연결하며, 그 중 14,000개 이상의 SQL 인젝션 이슈를 포함하고 있습니다. 위험은 명백합니다. 만약 애플리케이션이 신뢰할 수 없는 입력을 데이터베이스 해석기까지 허용하면, 공격자는 의도치 않은 명령을 실행하도록 할 수 있으며 데이터를 탈취하거나 변경할 수 있으며, 경우에 따라서는 시스템 전면 탈취로 이어질 수 있습니다.

SOC Prime 플랫폼에 가입하세요 새로운 리스크, 예를 들어 취약점 악용과 같은 상황에 대한 실시간 탐지 인텔리전스 및 준비된 사용 사례에 접근하십시오. 클릭하여 탐지 탐색 하여 “CVE” 태그로 필터링된 규칙의 전체 컬렉션을 확인하십시오.

탐지 탐색

모든 규칙은 다양한 SIEM, EDR 및 데이터 레이크 플랫폼과 호환되며 MITRE ATT&CK® 프레임워크에 매핑되어 있습니다. 각 규칙에는 CTI 링크, 공격 타임라인, 감사 설정, 대기 시간 안내 및 기타 관련 메타데이터가 포함되어 있습니다.

사이버 방어자들은 또한 Uncoder AI 를 사용하여 탐지 엔지니어링 워크플로우를 강화할 수 있습니다. 원시 위협 보고서에서 탐지 알고리즘을 생성하고, 빠른 IOC 스윕을 활성화하며, ATT&CK 태그를 예측하고, AI 팁을 통해 쿼리 코드를 최적화하고, 여러 SIEM, EDR 및 데이터 레이크 언어로 번역합니다.

CVE-2026-21643 분석

2026년 2월 6일, Fortinet은 자문서를 발표하며 CVE-2026-21643을 SQL 명령에 사용되는 특수 요소의 적절하지 않은 중화(SQ L Injection)로 설명했습니다. 여기서 원격 공격자는 특수하게 조작된 HTTP 요청을 보내 취약점을 유발할 수 있습니다. 이 이슈는 사전 인증 상태이기 때문에 노출되거나 접근 가능한 EMS 관리 인터페이스는 초기 접근의 중요한 표적이 될 수 있으며, 이는 빠른 발판 구축, 추가 도구 사용 및 종종 넓은 엔드포인트 가시성을 가지는 시스템에서의 가로 이동으로 이어질 가능성이 큽니다.

CVE-2026-21643는 CVSS 점수 9.8의 치명적인 수준을 획득하여 패치의 긴급성을 강조합니다. 방어자들에게 좋은 소식은 범위가 명확하다는 것입니다. Fortinet의 자문서는 오직 FortiClientEMS 7.4.4만이 영향을 받으며, 7.4.5 이상으로 업그레이드하여 문제가 해결되었으며, 7.2 및 8.0은 영향을 받지 않는다고 강조합니다.

프로액티브한 사이버 보안 전략 강화는 악용 위험 감소에 필수적입니다. SOC Prime의 AI 기반 탐지 인텔리전스 플랫폼 을 활용하여 엔터프라이즈급 사이버 방어를 구현하면 조직은 탐지 운영을 확장하고 보안 태세를 강화할 수 있습니다. 지금 등록하여 비즈니스와 가장 관련 있는 위협에 대한 가시성을 향상시키고 CVE-2026-21643과 같은 신규 치명적 위협이 나타날 때 대응 속도를 가속화하세요.

FAQ

CVE-2026-21643는 무엇이며 어떻게 작동합니까?

CVE-2026-21643는 Fortinet FortiClientEMS 7.4.4의 치명적인 SQL 인젝션 취약점입니다. 이 문제는 SQL 명령에서 특수 문자 처리가 부적절하여 발생하며, 원격 공격자가 특수하게 조작한 HTTP 요청을 보내 비인가 코드나 명령을 실행할 가능성이 있습니다.

CVE-2026-21643는 언제 처음 발견되었습니까?

Fortinet은 2026년 2월 6일 CVE-2026-21643을 설명하는 자문서를 발표했으며, 이 날이 또한 NVD에 의해 취약점이 기록된 날입니다. Fortinet 제품 보안 팀의 Gwendal Guégniaud가 이 결함을 발견하고 보고한 것으로 공로가 인정되었습니다.

CVE-2026-21643는 시스템에 어떤 위험을 제기합니까?

주요 위험은 FortiClient EMS 서버의 원격 침해입니다. 취약한 EMS 인스턴스에 접근할 수 있다면, 공격자는 조작된 HTTP 요청을 통해 SQL 인젝션을 남용하여 비인가된 작업을 실행하고 코드나 명령 실행으로 에스컬레이션할 가능성이 있습니다. 이는 데이터 접근 또는 조작, 서비스 방해뿐만 아니라 환경 깊숙이 침투할 수 있는 발판을 제공할 수 있습니다.

CVE-2026-21643가 2026년에도 나에게 영향을 줄 수 있는가?

예, FortiClient EMS 7.4.4를 실행 중이며 수정이 적용되지 않은 경우 영향을 받을 수 있습니다. Fortinet은 7.4.5 이상에서 문제가 해결되었음을 명시하며, 7.2와 8.0은 영향을 받지 않는다고 밝혔습니다.

CVE-2026-21643에 대한 보호는 어떻게 할 수 있습니까?

FortiClient EMS를 7.4.5 이상으로 업그레이드하고 EMS 웹 인터페이스에 대한 접근을 신뢰할 수 있는 관리자 네트워크로만 제한하십시오. 패치가 완료될 때까지, EMS 호스트와 해당 웹 트래픽에 대해 비정상적인 요청 및 예기치 않은 프로세스 활동을 모니터링을 증가시키십시오.

Name	Descripiton
PHPSESSID	Preserves user session state across page requests. Cookie generated by applications based on the PHP language. This is a general purpose identifier used to maintain user session variables. It is normally a random generated number, how it is used can be specific to the site, but a good example is maintaining a logged-in status for a user between pages.
sp_i	Used to store information about authenticated User.
sp_r	Used to store information about authenticated User.
sp_a	Used to store information about authenticated User.

Name	Descripiton
tuuid	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
tuuid_last_update	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
um	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
umeh	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded.
na_sc_x	Used by the social sharing platform AddThis to keep a record of parts of the site that has been visited in order to recommend other parts of the site.
APID	Collects anonymous data related to the user's visits to the website.
IDSYNC	Collects anonymous data related to the user's visits to the website.
_cc_aud	Collects anonymous statistical data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
_cc_cc	Collects anonymous statistical data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
_cc_dc	Collects anonymous statistical data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
_cc_id	Collects anonymous statistical data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The purpose is to segment the website's users according to factors such as demographics and geographical location, in order to enable media and marketing agencies to structure and understand their target groups to enable customised online advertising.
dpm	Via a unique ID that is used for semantic content analysis, the user's navigation on the website is registered and linked to offline data from surveys and similar registrations to display targeted ads.
acs	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.
clid	Collects anonymous data related to the user's visits to the website, such as the number of visits, average time spent on the website and what pages have been loaded, with the purpose of displaying targeted ads.
KRTBCOOKIE_#	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
PUBMDCID	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
PugT	Registers a unique ID that identifies the user's device during return visits across websites that use the same ad network. The ID is used to allow targeted ads.
ssi	Registers a unique ID that identifies a returning user's device. The ID is used for targeted ads.
_tmid	Registers a unique ID that identifies the user's device upon return visits. The ID is used to target ads in video clips.
wam-sync	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
wui	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
AFFICHE_W	Used by the advertising platform Weborama to determine the visitor's interests based on pages visits, content clicked and other actions on the website.
B	Collects anonymous data related to the user's website visits, such as the number of visits, average time spent on the website and what pages have been loaded. The registered data is used to categorise the users' interest and demographical profiles with the purpose of customising the website content depending on the visitor.
1P_JAR	These cookies are used to gather website statistics, and track conversion rates.
APISID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
HSID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
NID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
SAPISID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
SID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
SIDCC	Security cookie to protect users data from unauthorised access.
SSID	Google set a number of cookies on any page that includes a Google reCAPTCHA. While we have no control over the cookies set by Google, they appear to include a mixture of pieces of information to measure the number and behaviour of Google reCAPTCHA users.
__utmx	This cookie is associated with Google Website Optimizer, a tool designed to help site owners improve their wbesites. It is used to distinguish between two varaitions a webpage that might be shown to a visitor as part of an A/B split test. This helps site owners to detemine which version of a page performs better, and therefore helps to improve the website.
__utmxx	This cookie is associated with Google Website Optimizer, a tool designed to help site owners improve their wbesites. It is used to distinguish between two varaitions a webpage that might be shown to a visitor as part of an A/B split test. This helps site owners to detemine which version of a page performs better, and therefore helps to improve the website.

Name	Descripiton
_hjid	Hotjar cookie. This cookie is set when the customer first lands on a page with the Hotjar script. It is used to persist the random user ID, unique to that site on the browser. This ensures that behavior in subsequent visits to the same site will be attributed to the same user ID.
_hjIncludedInSample	This cookie is associated with web analytics functionality and services from Hot Jar, a Malta based company. It uniquely identifies a visitor during a single browser session and indicates they are included in an audience sample.
intercom-id-[xxx]	This cookie is used by Intercom as a session so that users can continue a chat as they move through the site.
intercom-session-[xxx]	Used to keeping track of sessions and remember logins and conversations.
demdex	Via a unique ID that is used for semantic content analysis, the user's navigation on the website is registered and linked to offline data from surveys and similar registrations to display targeted ads.
CookieConsent	Stores the user's cookie consent state for the current domain.
__cfduid	Used by the content network, Cloudflare, to identify trusted web traffic.
ss	These cookies enable the website to provide enhanced functionality and personalisation . They may be set by us or by third party providers whose services we have added to our pages. These services may include the Live Chat facility, Contact Us form(s), the Product Quotation forms and submission process, and the Email Newsletter sign up functionality .

Name	Descripiton
_ga	This cookie name is asssociated with Google Universal Analytics - which is a significant update to Google's more commonly used analytics service. This cookie is used to distinguish unique users by assigning a randomly generated number as a client identifier. It is included in each page. Registers a unique ID that is used to generate statistical data on how the visitor uses the website. request in a site and used to calculate visitor, session and campaign data for the sites analytics reports. By default it is set to expire after 2 years, although this is customisable by website owners.
_gat	Used by Google Analytics to throttle request rate. This cookie name is associated with Google Universal Analytics, according to documentation it is used to throttle the request rate - limiting the collection of data on high traffic sites. It expires after 10 minutes.
_gid	This cookie name is asssociated with Google Universal Analytics. This appears to be a new cookie and as of Spring 2017 no information is available from Google. It appears to store and update a unique value for each page visited. Registers a unique ID that is used to generate statistical data on how the visitor uses the website.
IDE	Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
r/collect	Used by Google DoubleClick to register and report the website user's actions after viewing or clicking one of the advertiser's ads with the purpose of measuring the efficacy of an ad and to present targeted ads to the user.
test_cookie	Used to check if the user's browser supports cookies.
collect	Used to send data to Google Analytics about the visitor's device and behaviour. Tracks the visitor across devices and marketing channels.
ads/user-lists/#	These cookies may be set through our site by our advertising partners. They may be used by those companies to build a profile of your interests and show you relevant adverts on other sites.
c	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
khaos	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
put_#	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
rpb	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
rpx	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.
tap.php	Registers anonymised user data, such as IP address, geographical location, visited websites, and what ads the user has clicked, with the purpose of optimising ad display based on the user's movement on websites that use the same ad network.

CVE-2026-21643: 심각한 FortiClient EMS 취약점, 인증되지 않은 원격 코드 실행 가능

CVE-2026-21643 분석

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