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Dossier · Vulnerability

Actively exploited · CISA KEV · NVD published 2023-06-13

CVE-2023-27997

A heap-based buffer overflow vulnerability [CWE-122] in FortiOS version 7.2.4 and below, version 7.0.11 and below, version 6.4.12 and below, version 6.0.16 and below and FortiProxy version 7.2.3 and below, version 7.0.9 and below, version 2.0.12 and below, version 1.2 all versions, version 1.1 all versions SSL-VPN may allow a remote attacker to execute arbitrary code or commands via specifically crafted requests.

  1. First PoC
  2. 1219 days →First cited attacker

Signals

Exploited in the wild
Yesadded 2023-06-13 · due 2023-07-04 · known ransomware use. An observation, not a forecast.
EPSS · 30-day forecast
86%Chance of exploitation in the next 30 days, 100th percentile of all CVEs. A forecast; KEV outranks it.
CVSS · NVD · CRITICAL
9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Internet exposure
not stated by sourcesNo exposure census on this CVE's dispatches.

Exploits

12 known · links only

GitHub PoCs · by trust, then stars12

  1. BishopFox/CVE-2023-27997-check ↗Trust ok 100

    Safely detect whether a FortiGate SSL VPN instance is vulnerable to CVE-2023-27997 based on response timing

    ★ 134 · created 2023-06-16

  2. lexfo/xortigate-cve-2023-27997 ↗Trust ok 100

    xortigate-cve-2023-27997

    ★ 63 · created 2023-10-12

  3. rio128128/CVE-2023-27997-POC ↗Trust ok 100

    POC FortiOS SSL-VPN buffer overflow vulnerability

    ★ 27 · created 2023-06-16

  4. delsploit/CVE-2023-27997 ↗Trust ok 100

    ★ 9 · created 2023-10-12

  5. TechinsightsPro/ShodanFortiOS ↗Trust ok 100

    Search vulnerable FortiOS devices via Shodan (CVE-2023-27997)

    ★ 2 · created 2023-07-11

  6. Vampsecure-Labs/vamp-forticheck ↗Trust ok 100

    VampSecure Labs: FortiOS CVE scanner (CVE-2018-13379, CVE-2022-40684, CVE-2023-27997, CVE-2024-21762)

    ★ 2 · created 2026-07-31

  7. abraxas/Fortigate-SSL-VPN-Exploit-Kit ↗Trust ok 100

    The FortiGate SSL-VPN pot of gold. CVE-2024-21762 and CVE-2023-27997. 79 working exploit clients. 53 hardware SKUs. 55 FortiOS builds.

    ★ 1 · created 2026-09-01

  8. imbas007/CVE-2023-27997-Check ↗Trust ok 100

    ★ 1 · created 2023-06-22

  9. Cyb3rEnthusiast/CVE-2023-27997 ↗Trust ok 100

    How to get access via CVE-2022-27997

    ★ 0 · created 2023-09-03

  10. node011/CVE-2023-27997-POC ↗Trust ok 100

    Fortigate SSL VPN buffer overflow exploit

    ★ 0 · created 2024-11-14

  11. onurkerembozkurt/fgt-cve-2023-27997-exploit ↗Trust ok 100

    FortiGate SSL-VPN CVE-2023-27997 Exploit PoC Script with ROP Chain

    ★ 0 · created 2025-04-18

  12. puckiestyle/cve-2023-27997 ↗Trust ok 100

    ★ 0 · created 2023-06-23

Fake proof-of-concept repositories have been used to deliver malware to the researchers who run them. The trust verdict is our engine's heuristic over the repository (account age, what it ships, how its stars arrived); it is a reason to read the code first, not a finding about its author.

On the wire

0 dispatches

No dispatch on our wire has named this CVE yet.

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