CVE-2015-2923

Name: CVE-2015-2923
Creator: NVD / NIST
Published: 2020-02-20T04:15:10.883+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.5/10EPSS 1.38%

Last modified Jun 17, 2026

CVE-2015-2923 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in FreeBSD through 10.1 allows remote attackers to reconfigure a hop-limit setting via a small hop_limit value in a Router Advertisement (RA) message.. EPSS estimates a 1.38% chance of exploitation in the next 30 days.

Description

The Neighbor Discovery (ND) protocol implementation in the IPv6 stack in FreeBSD through 10.1 allows remote attackers to reconfigure a hop-limit setting via a small hop_limit value in a Router Advertisement (RA) message.

Metrics

CVSS 3.1

6.5/10

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

EPSS Probability

1.38%

68.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions
Freebsd	Freebsd	< 10.1

References

http://openwall.com/lists/oss-security/2015/04/04/2Mailing List, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6fd99094de2b83d1d4c8457f2c83483b2828e75aPatch, Third Party Advisory
https://lists.freebsd.org/pipermail/freebsd-net/2015-April/041934.htmlMailing List, Vendor Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-15:09.ipv6.ascMitigation, Vendor Advisory
http://openwall.com/lists/oss-security/2015/04/04/2Mailing List, Third Party Advisory
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=6fd99094de2b83d1d4c8457f2c83483b2828e75aPatch, Third Party Advisory
https://lists.freebsd.org/pipermail/freebsd-net/2015-April/041934.htmlMailing List, Vendor Advisory
https://www.freebsd.org/security/advisories/FreeBSD-SA-15:09.ipv6.ascMitigation, Vendor Advisory

Timeline

Published: Feb 20, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2015-2923?

How severe is CVE-2015-2923?

CVE-2015-2923 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 1.38% probability of exploitation in the next 30 days.

How do I fix CVE-2015-2923?

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-2015-2923?

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

Scan your code now

Source: NVD / NIST