CVE-2023-3773

Name: CVE-2023-3773
Creator: NVD / NIST
Published: 2023-07-25T16:15:11.733+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.24%

Last modified Jun 17, 2026

CVE-2023-3773 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.. EPSS estimates a 0.24% chance of exploitation in the next 30 days.

Description

A flaw was found in the Linux kernel’s IP framework for transforming packets (XFRM subsystem). This issue may allow a malicious user with CAP_NET_ADMIN privileges to cause a 4 byte out-of-bounds read of XFRMA_MTIMER_THRESH when parsing netlink attributes, leading to potential leakage of sensitive heap data to userspace.

Metrics

CVSS 3.1

4.4/10

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

EPSS Probability

0.24%

14.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Redhat	Enterprise Linux	8.0
Redhat	Enterprise Linux	9.0
Fedoraproject	Fedora	All versions
Linux	Linux Kernel	All versions
Debian	Debian Linux	10.0
Debian	Debian Linux	12.0

References

https://access.redhat.com/errata/RHSA-2023:6583
https://access.redhat.com/security/cve/CVE-2023-3773Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2218944Issue Tracking, Third Party Advisory
https://access.redhat.com/errata/RHSA-2023:6583
https://access.redhat.com/security/cve/CVE-2023-3773Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2218944Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2023/10/msg00027.html
https://www.debian.org/security/2023/dsa-5492

Timeline

Published: Jul 25, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-3773?

How severe is CVE-2023-3773?

CVE-2023-3773 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.24% probability of exploitation in the next 30 days.

How do I fix CVE-2023-3773?

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-2023-3773?

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

Scan your code now

Source: NVD / NIST