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Vulnerability record · CVE-2017-9951 · published 17 July 2017

CVE-2017-9951: Memcached vulnerability

MMemcached · Memcached

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.

7.5 CVSS 3.0 High EPSS 4.2% · top 9.5%
7.5CVSS 3.0 base score, v2 5.0
4.2%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
12References, 2 tagged exploit
17 Jun 2026Last modified by NVD

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.

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://www.securityfocus.com/bid/99874
https://github.com/memcached/memcached/wiki/ReleaseNotes1439 Third Party Advisory
https://groups.google.com/forum/message/raw?msg=memcached/ubGWrkmrr4E/nrm1SeVJAQAJ Mailing ListThird 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/ ExploitTechnical DescriptionThird Party Advisory
http://www.securityfocus.com/bid/99874
https://github.com/memcached/memcached/wiki/ReleaseNotes1439 Third Party Advisory
https://groups.google.com/forum/message/raw?msg=memcached/ubGWrkmrr4E/nrm1SeVJAQAJ Mailing ListThird 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/ ExploitTechnical DescriptionThird Party Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2023-46853Memcached vulnerabilityIn Memcached before 1.6.22, an off-by-one error exists when processing proxy requests in proxy mode, if \n is used instead of \r\n.EPSS 0.76%9.8CVE-2016-8704Memcached integer overflow vulnerabilityAn integer overflow in the process_bin_append_prepend function in Memcached, which is responsible for processing multiple commands of Memcached binar…EPSS 23%9.8CVE-2016-8705Memcached integer overflow vulnerabilityMultiple integer overflows in process_bin_update function in Memcached, which is responsible for processing multiple commands of Memcached binary pro…EPSS 20%8.1CVE-2026-47783Memcached vulnerabilityIn memcached before 1.6.42, username data for SASL password database authentication has a timing side channel because a loop exits as soon as a valid…EPSS 1.3%8.1CVE-2026-47784Memcached vulnerabilityIn memcached before 1.6.42, password data for SASL password database authentication has a timing side channel because memcmp is used by sasl_server_u…EPSS 0.55%8.1CVE-2016-8706Memcached binary protocol SASL auth integer overflow leads to RCEAn integer overflow in the process_bin_sasl_auth function, which handles authentication commands in the Memcached binary protocol, can cause a heap o…EPSS 46%analysed7.5CVE-2023-46852Memcached classic buffer overflow vulnerabilityIn Memcached before 1.6.22, a buffer overflow exists when processing multiget requests in proxy mode, if there are many spaces after the "get" substr…EPSS 0.78%7.5CVE-2022-48571Memcached uncontrolled resource consumption vulnerabilitymemcached 1.6.7 allows a Denial of Service via multi-packet uploads in UDP.EPSS 1.1%

Source: NIST National Vulnerability Database (record CVE-2017-9951), CISA KEV, FIRST EPSS (scores of 2026-09-28). This page is refreshed as NVD updates the record.