CVE-2017-9951

Exp

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.

Published: 2017-07-17 Last update: 2026-05-13 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2017-9951 is rated High Exploit Risk (71.4/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.67%). 1 public exploit reference(s) are indexed (Exploit-DB). Public exploits are available—assess exposure, apply mitigations, and prioritize patching.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Public exploit references (Exploit-DB) for CVE-2017-9951

EDB-ID Source Kind Published Link
— nvd_ref exploit_tag Exploit-DB ↗

Exploit prediction scoring system (EPSS) score for CVE-2017-9951

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2025-12-31 3.84% 1.67% -2.16%
2 2025-11-21 1.69% 3.84% +2.15%
3 2025-11-18 — 1.69% —

Full EPSS history (15 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2017-9951

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2017-9951

OS Trackers for CVE-2017-9951

vendor priority summary link
debian not yet assigned CVE-2017-9951 not yet assigned priority: Debian including 1 source packages (memcached), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2017-9951
redhat low — https://access.redhat.com/security/cve/CVE-2017-9951
suse critical CVE-2017-9951 severity critical: SUSE including 19 source package names (memcached, memcached-1.2.6-5.17.4.1, …), 56 product×package rows across 39 product lines (SUSE CaaS Platform 4.0, SUSE Enterprise Storage 4, … (39 product lines)): Fixed 34, Known Not Affected 22. https://www.suse.com/security/cve/CVE-2017-9951/
ubuntu low CVE-2017-9951 low priority: Ubuntu including 1 source packages (memcached), 6 status rows across 6 suites (artful, trusty, upstream, xenial, yakkety, zesty): released 4, ignored 2. https://ubuntu.com/security/CVE-2017-9951

Affected software / configurations for CVE-2017-9951

Vendor Product Version Raw CPE
memcached memcached <= 1.4.38 cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*

References for CVE-2017-9951

cvelogic Threat Intelligence