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Fencer Intel
medium 5.0

CVE-2013-6371 json

The hash functionality in json-c before 0.12 allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted…

published 12y ago modified 4mo ago also EUVD-2013-6196

cvss
5.0
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
3.1%
EPSS 3.1% chance of exploitation in 30 days, percentile 87%
public exploits
0
none known

Summary

The hash functionality in json-c before 0.12 allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted JSON data, involving collisions.

Patch / fix

  • json-c json-c 0.12-20140410
  • json-c Debian 14, Debian 13, Debian 12 0.11-4

debian advisories DEBIAN-CVE-2013-6371

  • json-c Ubuntu 14.04 LTS 0.11-3ubuntu1.2

ubuntu advisories UBUNTU-CVE-2013-6371

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

  • json-c RHEL 7 0.11-4.el7_0

red hat advisories RHSA-2014:0703

  • json-c openSUSE Tumbleweed 0.19-1.1
  • json-c openSUSE Tumbleweed 0.12.1-1.3
  • rsyslog openSUSE Tumbleweed 8.23.0-2.1

opensuse advisories openSUSE-SU-2026:11188-1openSUSE-SU-2024:10013-1openSUSE-SU-2024:10498-1

Is CVE-2013-6371 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-2013-6371 updated cvss 5.0

json-c: hash collision DoS

  • Red Hat Software Collections php55-php-pecl-jsonc
    affected: no fix available
  • Red Hat Enterprise Linux Client (v. 7) json-c 0.11-4.el7_0 Red Hat Enterprise Linux Client Optional (v. 7) json-c 0.11-4.el7_0 Red Hat Enterprise Linux ComputeNode (v. 7) json-c 0.11-4.el7_0 Red Hat Enterprise Linux ComputeNode Optional (v. 7) json-c 0.11-4.el7_0 Red Hat Enterprise Linux Server (v. 7) json-c 0.11-4.el7_0 Red Hat Enterprise Linux Server Optional (v. 7) json-c 0.11-4.el7_0
    +2 more products
    Red Hat Enterprise Linux Workstation (v. 7) json-c 0.11-4.el7_0 Red Hat Enterprise Linux Workstation Optional (v. 7) json-c 0.11-4.el7_0
    fixed: vendor fix RHSA-2014:0703

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

3.11% chance of exploitation in the next 30 days, higher than 87% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
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.