How severe is CVE-2011-4971?

CVE-2011-4971 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-4971 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-4971?

CVE-2011-4971 primarily affects Memcached. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-4971?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2011-4971 published?

CVE-2011-4971 was published on 2013-12-12 and last updated on 2026-06-16.

CVE-2011-4971

CVE-2011-4971 is a medium-severity vulnerability in Memcached with a CVSS 2.0 base score of 5.0. Its EPSS exploit-prediction score of 22% places it in the 97th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-189.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 22% (97th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-189
Affected product: Memcached
Published: 2013-12-12
Last modified: 2026-06-16

Description

Multiple integer signedness errors in the (1) process_bin_sasl_auth, (2) process_bin_complete_sasl_auth, (3) process_bin_update, and (4) process_bin_append_prepend functions in Memcached 1.4.5 and earlier allow remote attackers to cause a denial of service (crash) via a large body length value in a packet.

Frequently asked questions

What is CVE-2011-4971?: Multiple integer signedness errors in the (1) process_bin_sasl_auth, (2) process_bin_complete_sasl_auth, (3) process_bin_update, and (4) process_bin_append_prepend functions in Memcached 1.4.5 and earlier allow remote attackers to cause a denial of service (crash) via a large body length value in a packet.
How severe is CVE-2011-4971?: CVE-2011-4971 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-4971 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 22% (97th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-4971?: CVE-2011-4971 primarily affects Memcached. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-4971?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-4971 published?: CVE-2011-4971 was published on 2013-12-12 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:memcached:memcached:*:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.2.7:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.2.8:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.4.0:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.4.1:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.4.2:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.4.3:*:*:*:*:*:*:*
cpe:2.3:a:memcached:memcached:1.4.4:*:*:*:*:*:*:*

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