How severe is CVE-2023-36640?

CVE-2023-36640 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-36640 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-36640?

CVE-2023-36640 primarily affects Fortinet Fortiproxy. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2023-36640?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2023-36640 have an EU (EUVD) identifier?

Yes. CVE-2023-36640 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-40584.

When was CVE-2023-36640 published?

CVE-2023-36640 was published on 2024-05-14 and last updated on 2026-06-17.

CVE-2023-36640

CVE-2023-36640 is a medium-severity vulnerability in Fortinet Fortiproxy with a CVSS 3.x base score of 6.7. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-134.

Key facts

Severity: Medium (CVSS 3.x base score 6.7)
EPSS exploit prediction: 0% (19th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2023-40584
Weakness: CWE-134
Affected product: Fortinet Fortiproxy
Published: 2024-05-14
Last modified: 2026-06-17

Description

A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.4.0, FortiOS 7.2.0 through 7.2.5, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiOS 6.2 all versions, FortiOS 6.0.0 through 6.0.16, FortiPAM 1.1.0, FortiPAM 1.0 all versions, FortiProxy 7.2.0 through 7.2.5, FortiProxy 7.0.0 through 7.0.11, FortiProxy 2.0 all versions, FortiProxy 1.2 all versions, FortiProxy 1.1 all versions, FortiProxy 1.0 all versions allows attacker to execute unauthorized code or commands via specially crafted commands

Frequently asked questions

What is CVE-2023-36640?: A use of externally-controlled format string vulnerability in Fortinet FortiOS 7.4.0, FortiOS 7.2.0 through 7.2.5, FortiOS 7.0 all versions, FortiOS 6.4 all versions, FortiOS 6.2 all versions, FortiOS 6.0.0 through 6.0.16, FortiPAM 1.1.0, FortiPAM 1.0 all versions, FortiProxy 7.2.0 through 7.2.5, FortiProxy 7.0.0 through 7.0.11, FortiProxy 2.0 all versions, FortiProxy 1.2 all versions, FortiProxy 1.1 all versions, FortiProxy 1.0 all versions allows attacker to execute unauthorized code or commands via specially crafted commands
How severe is CVE-2023-36640?: CVE-2023-36640 has a CVSS 3.x base score of 6.7, rated medium severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-36640 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (19th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-36640?: CVE-2023-36640 primarily affects Fortinet Fortiproxy. In total, 4 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2023-36640?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2023-36640 have an EU (EUVD) identifier?: Yes. CVE-2023-36640 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2023-40584.
When was CVE-2023-36640 published?: CVE-2023-36640 was published on 2024-05-14 and last updated on 2026-06-17.

References

https://fortiguard.com/psirt/FG-IR-23-137

Affected products (4)

cpe:2.3:a:fortinet:fortiproxy:*:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortipam:*:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:*:*:*:*:*:*:*:*
cpe:2.3:o:fortinet:fortios:7.2.0:*:*:*:*:*:*:*

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Other CWE-134 vulnerabilities

CVE-2012-1851 — Critical (CVSS 10.0): Format string vulnerability in the Print Spooler service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2,…
CVE-2012-0242 — Critical (CVSS 10.0): Format string vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary…
CVE-2011-2475 — Critical (CVSS 10.0): Format string vulnerability in ECTrace.dll in the iMailGateway service in the Internet Mail Gateway in OneBridge Server…
CVE-2011-1568 — Critical (CVSS 10.0): Format string vulnerability in the logText function in shmemmgr9.dll in IGSSdataServer.exe 9.00.00.11074, and…
CVE-2010-4235 — Critical (CVSS 10.0): Format string vulnerability in RealNetworks Helix Server 12.x, 13.x, and 14.x before 14.2, and Helix Mobile Server…
CVE-2011-0270 — Critical (CVSS 10.0): Format string vulnerability in nnmRptConfig.exe in HP OpenView Network Node Manager (OV NNM) 7.51 and 7.53 allows…

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