The try_read_command function in memcached.c in memcached before 1.4.39 allows remote…
Priority MEDIUM 40Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- —
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Will not fix Red Hat: no fix planned
Attack profile from CVSS 3.0 · NVD. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
EPSS 0.04166 90th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Will not fix Red Hat: no fix planned
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
No fixed version listed by the sources yet.
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 7 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux OpenStack Platform 7 (Kilo) | Affected | No fix planned: Will not fix |
| Red Hat Mobile Application Platform 4 | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 10 (Newton) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 11 (Ocata) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 8 (Liberty) | Affected | No fix planned: Will not fix |
| Red Hat OpenStack Platform 9 (Mitaka) | Affected | No fix planned: Will not fix |
Not affected: 1 product
- Red Hat OpenStack Platform 12 (Pike)
Timeline
- 2026-10-02 Threatist record created from CVE-2017-9951
- 2026-10-03 Alias added: GHSA-vpcm-5gwm-79h2
References
More Memcached vulnerabilities
- TI-2018-15768 Memcached version 1.5.5 contains an Insufficient Control of Network Message Volume… CVSS 3.0HIGH 7.5
- TI-2020-14353 Memcached 1.6.0 before 1.6.3 allows remote attackers to cause a denial of service (daemon… CVSS 3.1HIGH 7.5
- TI-2016-07164 Integer overflow in Memcached CVSS 3.0HIGH 8.1
- TI-2016-07162 Integer overflow in Memcached CVSS 3.0CRITICAL 9.8
- TI-2016-07163 Integer overflow in Memcached CVSS 3.0CRITICAL 9.8
- TI-2021-15418 Buffer Overflow vulnerability in authfile.c memcached 1.6.9 allows attackers to cause a… CVSS 3.1MEDIUM 5.5
Sources
- CVE-2017-9951 · CVE Program
- CVE-2017-9951 · NVD
- FIRST EPSS
- GHSA-vpcm-5gwm-79h2 · GitHub Advisory Database · CC BY 4.0
- CVE-2017-9951 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences