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Fencer Intel
high 7.5

CVE-2019-11596 json

In memcached before 1.5.14, a NULL pointer dereference was found in the "lru mode" and "lru temp_ttl" commands.

published 7y ago modified 4mo ago also EUVD-2019-3266

cvss
7.5
version 3.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.0%
EPSS 3.0% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

In memcached before 1.5.14, a NULL pointer dereference was found in the "lru mode" and "lru temp_ttl" commands. This causes a denial of service when parsing crafted lru command messages in process_lru_command in memcached.c.

Patch / fix

  • memcached memcached 1.5.14
  • memcached Debian 14, Debian 13, Debian 12 1.5.6-1.1

debian advisories DEBIAN-CVE-2019-11596

  • memcached Ubuntu 18.04 LTS 1.5.6-0ubuntu1.1

ubuntu advisories UBUNTU-CVE-2019-11596

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • memcached openstack 13 1.4.39-3.el7ost
  • memcached RHEL 8 1.5.9-3.el8

red hat advisories RHSA-2020:5583RHSA-2020:1576

  • kibana OpenStack Cloud 7 4.6.3-5.1
  • ansible OpenStack Cloud 7 2.2.3.0-12.2
  • grafana OpenStack Cloud 7 4.6.5-1.14.1
  • memcached OpenStack Cloud 7 1.5.17-3.6.1
  • python-py OpenStack Cloud 7 1.8.1-11.12.1
  • zookeeper OpenStack Cloud 7 3.4.10-6.1
  • crowbar-ha OpenStack Cloud 7 4.0+git.1585316203.d6ad2c8-4.52.4
  • keepalived OpenStack Cloud 7 2.0.19-1.8.1

suse advisories SUSE-RU-2020:2072-1SUSE-SU-2020:1381-1SUSE-SU-2020:1190-1SUSE-SU-2020:1066-1SUSE-SU-2020:0843-1

  • memcached openSUSE Leap 15.1 1.5.6-lp151.4.3.1

opensuse advisories openSUSE-SU-2020:0721-1

Is CVE-2019-11596 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2019-11596 updated cvss 7.5

memcached: null-pointer dereference in "lru mode" and "lru temp_ttl" causing denial of service

  • Red Hat OpenStack Platform 10 (Newton) memcached
    affected: no fix planned “Will not fix”
  • Red Hat OpenStack Platform 14 (Rocky) memcached
    affected: no fix available
  • Red Hat Enterprise Linux AppStream (v. 8) memcached 1.5.9-3.el8
    fixed: vendor fix RHSA-2020:1576
  • Red Hat OpenStack Platform 13.0 memcached 1.4.39-3.el7ost Red Hat OpenStack Platform 13.0 for RHEL 7.6 EUS Server memcached 1.4.39-3.el7ost
    fixed: vendor fix RHSA-2020:5583
  • Red Hat Enterprise Linux 6 memcached Red Hat Enterprise Linux 7 memcached Red Hat OpenStack Platform 9 (Mitaka) memcached
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.96% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

Exploits and checks

  • github.com https://github.com/memcached/memcached/issues/474 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.0 7.5 CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD 2.0 5.0 AV:N/AC:L/Au:N/C:N/I:N/A:P

Classification

Weakness

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.