5.5

CVE-2023-51384: debian debian_linux Improper Access Control

Modified
AliasesALPINE-CVE-2023-51384UBUNTU-CVE-2023-51384DEBIAN-CVE-2023-51384
Published 18-12-2023Last modified 15-10-2026

Vulnerability summary

CVE-2023-51384 is a medium (CVSS 5.5) Improper Access Control vulnerability in debian debian_linux. EPSS estimates a 0.43% chance of exploitation in the next 30 days, higher than 36.8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.43%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 1
MGASA-2024-0010USN-6565-1

Timeline

  1. 18-12-2023
    PublishedVulnerability first disclosed.
  2. 15-10-2026
    Last modifiedVulnerability information updated.

Description

In ssh-agent in OpenSSH before 9.6, certain destination constraints can be incompletely applied. When destination constraints are specified during addition of PKCS#11-hosted private keys, these constraints are only applied to the first key, even if a PKCS#11 token returns multiple keys.

CVSS metrics

5 scores · 5 sources · 1 version

EPSS trend

Probability

0.43%

Chance of exploitation in the next 30 days

Percentile

37%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.43% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Debian2 products
  • openssh< 1:9.2p1-2+deb12u2 | < 1:9.6p1-1
  • debian_linuxEOL11.0 | 12.0
Ubuntu2 products
  • openssh< 1:8.9p1-3ubuntu0.6 | < 1:9.6p1-3ubuntu1
  • openssh-ssh1All versions (No fix recorded)
Alpine1 product
  • openssh≥ 8.9, < 9.0_p1-r5 | ≥ 8.9, < 9.1_p1-r5 | ≥ 8.9, < 9.6_p1-r0
Openbsd1 product

4 vendors · 6 products

References

18 links
Show all 18 references