Is CVE-2023-6780 in the CISA KEV catalog?

No. CVE-2023-6780 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2023-6780?

CVE-2023-6780 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2023-6780?

CVE-2023-6780 has an EPSS score of 2.69% (84th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2023-6780?

Upgrade glibc on debian 12 to 2.36-9+deb12u4 or later. Fixes are available for 3 affected products.

CVE & CISA-KEV Catalog

CVE-2023-6780

MEDIUMEPSS 84th pctl

5.3

CVSS v3

NVD

Description

An integer overflow was found in the __vsyslog_internal function of the glibc library. This function is called by the syslog and vsyslog functions. This issue occurs when these functions are called with a very long message, leading to an incorrect calculation of the buffer size to store the message, resulting in undefined behavior. This issue affects glibc 2.37 and newer.

CWE-131 CWE-190Integer Overflow

How to fix

Remediation Available

glibcDebian

Fixed in:2.36-9+deb12u4CVE-2023-6780

Fixed in:2.37-15CVE-2023-6780

glibcUbuntu

Fixed in:2.38-1ubuntu6.1USN-6620-1

libc6Ubuntu

Fixed in:2.38-1ubuntu6.1USN-6620-1

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityLow

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Exploit Intelligence

2.69%probability of exploitation in 30 days

84thpercentile

Elevated risk: more likely to be exploited than 84% of all known CVEs.

References

Exploit3

Third-Party Advisory3

Issue Tracking1

bugzilla.redhat.com

Mailing List2

Other references2

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-12.