CVE-2017-9951

Publication date 17 July 2017

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

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.

From the Ubuntu Security Team

Daniel Shapira discovered an integer overflow issue in Memcached. A remote attacker could use this to cause a denial of service (daemon crash).

Status

Show unmaintained releases

Package	Ubuntu Release	Status
memcached	17.10 artful	Fixed 1.4.33-1ubuntu3.2
	17.04 zesty	Ignored end of life
	16.10 yakkety	Ignored end of life
	16.04 LTS xenial	Fixed 1.4.25-2ubuntu1.3
	14.04 LTS trusty	Fixed 1.4.14-0ubuntu9.2

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package	Patch details
memcached	Upstream: 3286294

Severity score breakdown

Parameter	Value
Base score	7.5 · High
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

References

Related Ubuntu Security Notices (USN)

USN-3588-1
Memcached vulnerabilities
5 March 2018