CVE-2013-4548

Name: CVE-2013-4548
Creator: NVD / NIST
Published: 2013-11-08T15:55:13.747+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 2.67%

Last modified Jun 16, 2026

CVE-2013-4548 is a vulnerability of currently unknown severity. The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.. EPSS estimates a 2.67% chance of exploitation in the next 30 days.

Description

The mm_newkeys_from_blob function in monitor_wrap.c in sshd in OpenSSH 6.2 and 6.3, when an AES-GCM cipher is used, does not properly initialize memory for a MAC context data structure, which allows remote authenticated users to bypass intended ForceCommand and login-shell restrictions via packet data that provides a crafted callback address.

Metrics

EPSS Probability

2.67%

83.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-264

Affected Software

Vendor	Product	Versions
Openbsd	Openssh	6.2
Openbsd	Openssh	6.3

References

Timeline

Published: Nov 8, 2013
Last Modified: Jun 16, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2013-4548?

How severe is CVE-2013-4548?

Severity scoring for CVE-2013-4548 is pending analysis. The EPSS model estimates a 2.67% probability of exploitation in the next 30 days.

How do I fix CVE-2013-4548?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2013-4548?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST