CVE-2017-9951: n/a vulnerability

CVE-2017-9951: The try_read_command function in memcached.c in memcached before 1.4.39 allows remote attackers to cause a...

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.

UnknownCVSS not scoredNot KEV-listedUpdatedAug 5, 2024, 17:24 UTC (UTC+00:00)

Security readout for executives and security teams

CVE-2017-9951 is a memcached denial-of-service flaw. A remote requester could crash vulnerable memcached servers before version 1.4.39 by triggering a memory read error during add or set key handling. The main business impact is service disruption for applications that depend on memcached for caching or session performance. Exposure is most likely where memcached versions before 1.4.39 are still running, including older distribution packages not updated with Ubuntu or Debian security fixes. Internet-facing or untrusted-network memcached instances carry higher operational risk because the reported impact is remotely triggerable denial of service. Prioritize remediation for internet-facing or shared-network memcached services because a crash can degrade dependent applications. Internal-only, patched, or tightly firewalled instances are lower urgency but should still be verified. Mitigation focus: Upgrade memcached to 1.4.39 or a vendor-patched package.; Apply relevant Ubuntu or Debian security updates where applicable.; Restrict memcached access to trusted application hosts only..

Prepared: Jun 13, 2026, 04:25 UTC (UTC+00:00)

Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.

Potential ATT&CK relevance

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Vulnerability profileCVE Program record

Severity: Unknown
CVSS: Not scored
Known Exploited: No
Published: Jul 17, 2017, 06:00 UTC (UTC+00:00)

Official CVE source material

CNA and ADP enrichment extracted from CVE v5

These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.

0CVSS vectors

0Timeline events

0ADP providers

6Source links

CVSS and timeline data

No CVSS vectors or timeline events were available in the normalized CVE source material.

Source materials

CVE List V5 sourceCVE List V5
USN-3588-1CVE reference · vendor-advisory, x_refsource_UBUNTU
https://github.com/memcached/memcached/wiki/ReleaseNotes1439CVE reference · x_refsource_MISC
DSA-4218CVE reference · vendor-advisory, x_refsource_DEBIAN
https://www.twistlock.com/2017/07/13/cve-2017-9951-heap-overflow-memcached-server-1-4-38-twistlock-vulnerability-report/CVE reference · x_refsource_MISC
https://groups.google.com/forum/message/raw?msg=memcached/ubGWrkmrr4E/nrm1SeVJAQAJCVE reference · x_refsource_MISC

Affected products

Products and packages named in the record

VendorProductVersion / packageStatus

n/an/an/aListed

Weakness

CWE details

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