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CVE-2017-9951

26
FAUCET Score

CVE-2017-9951 is a denial-of-service vulnerability affecting memcached versions prior to 1.4.39. It allows remote attackers to trigger a segmentation fault and heap-based buffer over-read by sending a specially crafted add/set key request, stemming from an incomplete fix for CVE-2016-8705. This vulnerability carries a CVSSv3 score of 7.5 (High), indicating it can be exploited remotely with low attack complexity and without user interaction, leading to high availability impact. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.4.38CPE matchmatch criteria
cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
4.17%
Probability of exploitation in next 30 days
EPSS Percentile
89.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0417 is in the 82nd percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (8)

redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat Enterprise Linux OpenStack Platform 7 (Kilo)Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat Mobile Application Platform 4Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 10 (Newton)Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 11 (Ocata)Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 8 (Liberty)Fixed in: memcached
redhatend of lifevia redhat_api
Product: Red Hat OpenStack Platform 9 (Mitaka)Fixed in: memcached

Vendor Advisories (1)

redhatCVE-2017-9951Low

memcached: Heap-based buffer over-read in try_read_command function (incomplete fix for CVE-2016-8705)

Jul 17, 2017

References

github.com / memcached/memcached/wiki/ReleaseNotes1439
Third Party Advisory
groups.google.com / forum/message/raw
Mailing ListThird Party Advisory
usn.ubuntu.com / 3588-1
debian.org / security/2018/dsa-4218
twistlock.com / 2017/07/13/cve-2017-9951-heap-overflow-memcached-server-1-4-38-twistlock-vulnerability-report
ExploitTechnical DescriptionThird Party Advisory
securityfocus.com / bid/99874