SARA / Free Tools / CVE / CVE-2023-6918

CVE-2023-6918 — A flaw was found in the libssh implements abstract layer for message digest (MD)

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or

CVSS
3.7 LOW
EPSS
0.36% (top 42.00%)
CWE
CWE-252
Published
2023-12-18T23:27:48.540Z
Last modified
2025-11-21T06:23:44.733Z
CVSS vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L

01What is this vulnerability?

A flaw was found in the libssh implements abstract layer for message digest (MD) operations implemented by different supported crypto backends. The return values from these were not properly checked, which could cause low-memory situations failures, NULL dereferences, crashes, or usage of the uninitialized memory as an input for the KDF. In this case, non-matching keys will result in…

02Affected products

VendorProductVersions
Red HatRed Hat Enterprise Linux 80:0.9.6-14.el8
Red HatRed Hat Enterprise Linux 80:0.9.6-14.el8
Red HatRed Hat Enterprise Linux 90:0.10.4-13.el9
Red HatRed Hat Enterprise Linux 90:0.10.4-13.el9
Red HatRed Hat Enterprise Linux 6unspecified
Red HatRed Hat Enterprise Linux 7unspecified
Red HatRed Hat Enterprise Linux 7unspecified

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Ask SARA in chat to draft a starting detection for this CVE in your stack of choice.

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

09References

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