VulnerabilityModified
CVE-2020-12762
json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.
HIGH 7.8EPSS 1.90%
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (1.90%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- EPSS
- 1.90% probability · 79th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-190, CWE-787
- Affected
- json-c/json-c · fedoraproject/fedora · debian/debian linux · canonical/ubuntu linux · siemens/sinec ins
- Source
- cve@mitre.org
EPSS 1.9% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfThird Party Advisory
- https://github.com/json-c/json-c/pull/592Exploit, Patch, Third Party Advisory
- https://github.com/rsyslog/libfastjson/issues/161Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00032.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00034.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00031.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/06/msg00023.htmlThird Party Advisory
- 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/202006-13Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210521-0001/Third Party Advisory
- https://usn.ubuntu.com/4360-1/Third Party Advisory
- https://usn.ubuntu.com/4360-4/Third Party Advisory
- https://www.debian.org/security/2020/dsa-4741Third Party Advisory
- https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfThird Party Advisory
- https://github.com/json-c/json-c/pull/592Exploit, Patch, Third Party Advisory
- https://github.com/rsyslog/libfastjson/issues/161Exploit, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00032.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/05/msg00034.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/07/msg00031.htmlMailing List, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2023/06/msg00023.htmlThird Party Advisory
- https://lists.debian.org/debian-lts-announce/2025/07/msg00021.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/202006-13Third Party Advisory
- https://security.netapp.com/advisory/ntap-20210521-0001/Third Party Advisory
- https://usn.ubuntu.com/4360-1/Third Party Advisory
- https://usn.ubuntu.com/4360-4/Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.