What’s Vulnerable › Vulnerabilities

CVE-2020-12762

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.9% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-05-09 · updated 2026-10-14
• Weakness: CWE-190

Description

json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.10, 20.04
• Debian Linux: 8.0, 9.0, 10.0
• Fedoraproject Fedora: 30, 31, 32
• Json-C: before 0.15-20200726 — fixed in 0.15-20200726
• Siemens SINEC INS: 1.0, 1.0-sp1

How to fix

Upgrade to a fixed version: Json-C 0.15-20200726. Check the vendor advisory for mitigations.

References

• https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
• https://github.com/json-c/json-c/pull/592
• https://github.com/rsyslog/libfastjson/issues/161
• https://lists.debian.org/debian-lts-announce/2020/05/msg00032.html
• https://lists.debian.org/debian-lts-announce/2020/05/msg00034.html
• https://lists.debian.org/debian-lts-announce/2020/07/msg00031.html
• https://lists.debian.org/debian-lts-announce/2023/06/msg00023.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBR36IXYBHITAZFB5PFBJTED22WO5ONB/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CQQRRGBQCAWNCCJ2HN3W5SSCZ4QGMXQI/
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W226TSCJBEOXDUFVKNWNH7ETG7AR6MCS/
• https://security.gentoo.org/glsa/202006-13
• https://security.netapp.com/advisory/ntap-20210521-0001/

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