CVE-2017-9951

Name: CVE-2017-9951
Creator: NVD / NIST
Published: 2017-07-17T13:18:30.97+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 4.17%

Last modified Jun 17, 2026

CVE-2017-9951 is a vulnerability of currently unknown severity. The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-8705.. EPSS estimates a 4.17% chance of exploitation in the next 30 days.

Description

The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a denial of service (segmentation fault) via a request to add/set a key, which makes a comparison between signed and unsigned int and triggers a heap-based buffer over-read. NOTE: this vulnerability exists because of an incomplete fix for CVE-2016-8705.

Metrics

EPSS Probability

4.17%

89.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Vendor	Product	Versions
Memcached	Memcached	<= 1.4.38

References

http://www.securityfocus.com/bid/99874
https://github.com/memcached/memcached/wiki/ReleaseNotes1439Third Party Advisory
https://groups.google.com/forum/message/raw?msg=memcached/ubGWrkmrr4E/nrm1SeVJAQAJMailing List, Third Party Advisory
https://usn.ubuntu.com/3588-1/
https://www.debian.org/security/2018/dsa-4218
https://www.twistlock.com/2017/07/13/cve-2017-9951-heap-overflow-memcached-server-1-4-38-twistlock-vulnerability-report/Exploit, Technical Description, Third Party Advisory
http://www.securityfocus.com/bid/99874
https://github.com/memcached/memcached/wiki/ReleaseNotes1439Third Party Advisory
https://groups.google.com/forum/message/raw?msg=memcached/ubGWrkmrr4E/nrm1SeVJAQAJMailing List, Third Party Advisory
https://usn.ubuntu.com/3588-1/
https://www.debian.org/security/2018/dsa-4218
https://www.twistlock.com/2017/07/13/cve-2017-9951-heap-overflow-memcached-server-1-4-38-twistlock-vulnerability-report/Exploit, Technical Description, Third Party Advisory

Timeline

Published: Jul 17, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2017-9951?

How severe is CVE-2017-9951?

Severity scoring for CVE-2017-9951 is pending analysis. The EPSS model estimates a 4.17% probability of exploitation in the next 30 days.

How do I fix CVE-2017-9951?

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-2017-9951?

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

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Source: NVD / NIST