ExploitedIn CISA KEVFix available

CVE-2023-27997

Exploitation confirmed. First attested on 2023-06-13 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · kevintel.

Published2023-06-13
WeaknessCWE-122 · CWE-787

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2023-06-13Added to the CISA KEV catalogCISA KEV
2023-06-13Listed as exploited by GCVEGCVE
2023-06-13Exploitation first reportedCISA KEV
2023-06-1309:15CVE publishedNVD
2024-10-2313:18SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-03 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-27997?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-27997?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Fortinet FortiOSversion to verify

Branch	Affected	Fixed in	Source
6.0	≥ 6.0.0, ≤ 6.0.16	no fix published	NVD
6.2	≥ 6.2.0, ≤ 6.2.13	no fix published	NVD
6.4	≥ 6.4.0, ≤ 6.4.12	no fix published	NVD
7.0	≥ 7.0.0, ≤ 7.0.11	no fix published	NVD
7.2	≥ 7.2.0, ≤ 7.2.4	no fix published	NVD
6.0	≥ 6.0.12, ≤ 6.0.16	no fix published	NVD
6.2	≥ 6.2.9, ≤ 6.2.13	no fix published	NVD
6.0	= 6.0.10	no fix published	NVD
6.2	= 6.2.4	no fix published	NVD
6.2	= 6.2.6	no fix published	NVD
6.2	= 6.2.7	no fix published	NVD
6.4	= 6.4.2	no fix published	NVD

Fortinet fortiproxy

Branch	Affected	Fixed in	Source
1.1	≥ 1.1.0, ≤ 1.1.6	no fix published	NVD
1.2	≥ 1.2.0, ≤ 1.2.13	no fix published	NVD
2.0	≥ 2.0.0, ≤ 2.0.12	no fix published	NVD
7.0	≥ 7.0.0, ≤ 7.0.9	no fix published	NVD
7.2	≥ 7.2.0, ≤ 7.2.3	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA3 products

As fortinet, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

Fortinet FortiOS-6K7Kother versions: not affected
Affected
- = 7.0.10no fix stated
- = 7.0.5no fix stated
- = 6.4.12no fix stated
- = 6.4.10no fix stated
- = 6.4.8no fix stated
- = 6.4.6no fix stated
- = 6.4.2no fix stated
- ≥ 6.2.9, ≤ 6.2.13no fix statedsemver
4 more version lines in the CVE record.
Fortinet FortiProxyother versions: not affected
Affected
- ≥ 7.2.0, ≤ 7.2.3no fix statedsemver
- ≥ 7.0.0, ≤ 7.0.9no fix statedsemver
- ≥ 2.0.0, ≤ 2.0.12no fix statedsemver
- ≥ 1.2.0, ≤ 1.2.13no fix statedsemver
- ≥ 1.1.0, ≤ 1.1.6no fix statedsemver
Fortinet FortiOSother versions: not affected
Affected
- ≥ 7.2.0, ≤ 7.2.4no fix statedsemver
- ≥ 7.0.0, ≤ 7.0.11no fix statedsemver
- ≥ 6.4.0, ≤ 6.4.12no fix statedsemver
- ≥ 6.2.0, ≤ 6.2.13no fix statedsemver
- ≥ 6.0.0, ≤ 6.0.16no fix statedsemver

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of Use CVE recordupdated 2023-06-13

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-25-044-06 CISA1 known affected
Siemens RUGGEDCOM APE1808
RUGGEDCOM APE1808
SSA-770770 Siemens ProductCERT1 known affected
SSA-770770: Multiple Vulnerabilities in Fortigate NGFW Before V7.4.7 on RUGGEDCOM APE1808 Devices
RUGGEDCOM APE1808

Full record on NVD

Fix

CISA’s required action: Apply updates per vendor instructions.due 2023-07-04
Vendor fix Siemens ProductCERT SSA-770770 · 1 productUpdate Fortigate NGFW to V7.4.7. Contact customer support to receive patch and update information
Vendor fix CISA ICSA-25-044-06 · 1 productUpdate Fortigate NGFW to V7.4.7. Contact customer support to receive patch and update information
Mitigation from the vendor Siemens ProductCERT SSA-770770 · 1 productRefer to Fortinet Blog for mitigation measures https://www.fortinet.com/blog/psirt-blogs/analysis-of-threat-actor-activity
Mitigation from the vendor CISA ICSA-25-044-06 · 1 productRefer to Fortinet Blog for mitigation measures https://www.fortinet.com/blog/psirt-blogs/analysis-of-threat-actor-activity

Advisories and patches

fortiguard.comVendor Advisory

Detection

read 2026-11-02 22:42 UTC

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: 12 repositories, unverifiedrio128128/CVE-2023-27997-POCBishopFox/CVE-2023-27997-checkimbas007/CVE-2023-27997-Checkpuckiestyle/cve-2023-27997TechinsightsPro/ShodanFortiOS
Metasploit modules: none listed

CISA Known Exploited Vulnerability

Date Added: 2023-06-13
Patch Due Date: 2023-07-04
Ransomware Use: Known
Required Action: Apply updates per vendor instructions.

Sources

CISA KEVKEV entry2023-06-13
ENISA EUVDexploitation2023-06-132023-06-13
GCVEexploitation2023-06-13
CISA-ADPSSVC decisionactive2024-10-23
OpenCVESSVC decisionactive—
CNACVSS 3.19.8known since 2026-10-23
NVDCVSS 3.19.8read 2026-10-23
CNAweakness (CWE)CWE-122known since 2026-10-23
NVDweakness (CWE)CWE-787read 2026-10-23
FIRST EPSSEPSS score85.7 %read 2026-11-02
PoC-in-GitHubproof of concept12read 2026-11-02
GitHub Advisoriesadvisory—

Identifiers

EUVD-2023-31722same flawENISA EUVD · LicenseRef-ENISA-legal-notice
GHSA-2hj2-fcr9-9p35same flawGitHub Advisory Database · CC-BY-4.0

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2023-06-13
Last Modified: 2026-07-31
NVD status: Analyzed
GitHub Advisory: GHSA-2hj2-fcr9-9p35

Frequently asked questions

What is CVE-2023-27997?

Is CVE-2023-27997 actively exploited?

Yes. CVE-2023-27997 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2023-07-04.

What is the CVSS score for CVE-2023-27997?

CVE-2023-27997 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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Sources for this record

CISA ICS advisories (CSAF) · Public domain (US Government work)
CISA KEV · CC0-1.0 (cisagov/kev-data)
CVE Program · CVE Program Terms of Use
ENISA EU Vulnerability Database · ENISA legal notice §1.2 (reproduction authorised, provided the source is acknowledged)
FIRST EPSS · EPSS terms of use (free use, attribution requested)
GCVE · GCVE dump terms (preserve source attribution)
GitHub Advisory Database · CC-BY-4.0 · GHSA-2hj2-fcr9-9p35
NVD · Public domain (17 U.S.C. § 105) for NVD-authored data; third-party content under its own terms
OpenCVE · OpenCVE terms of service · terms restrict redistribution
PoC-in-GitHub · CC0-1.0
Siemens ProductCERT (CSAF) · TLP:WHITE (commercial use and redistribution granted)
CISA Vulnrichment · CC0-1.0

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