CVE-2020-12762

HIGHScheduled

Published:May 9, 2020(6 years ago)

Modified:Nov 3, 2025

Local AccessNo Auth RequiredLow Complexity

Vulnerability 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.

Attack Characteristics

Local AccessLow ComplexityNo Auth NeededUser Interaction Required

🤖

AI analysis not yet available

Plain-English explanation, risk summary, and remediation steps will appear here once AI analysis is complete.

No Fix Known

No patch has been released yet. Apply workarounds or mitigations where available.

Affected Software

Vendor	Product	Versions	Fixed In
json-c	json-c	0.15-20200726	-
fedoraproject	fedora	-	-
fedoraproject	fedora	-

Timeline

Published
CVE disclosed publicly
May 9, 20206 years ago
Last Modified
Most recent update
Nov 3, 20256 months ago
Indexed to CVEInsight
Added to this platform
Mar 29, 20261 month ago

References

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

CVSS Score

v3.1

7.8/ 10.0

HIGH

AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

At a Glance

Affected Products

References

json-c / json-c

https://github.com/rsyslog/libfastjson/issues/161Exploit

https://lists.debian.org/debian-lts-announce/2020/05/msg00032.htmlMailing List

https://lists.debian.org/debian-lts-announce/2020/05/msg00034.htmlMailing List

https://lists.debian.org/debian-lts-announce/2020/07/msg00031.htmlMailing List

https://lists.debian.org/debian-lts-announce/2023/06/msg00023.htmlThird Party Advisory

https://lists.fedoraproject.org/archives/list/package-announce%40lists...

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

https://github.com/rsyslog/libfastjson/issues/161Exploit

https://lists.debian.org/debian-lts-announce/2020/05/msg00032.htmlMailing List

https://lists.debian.org/debian-lts-announce/2020/05/msg00034.htmlMailing List

https://lists.debian.org/debian-lts-announce/2020/07/msg00031.htmlMailing List

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...

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

CVSS v3 Vector

CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploitability

Attack VectorLocal

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

Impact

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

Impact Analysis

ConfidentialityHigh

NoneLowHigh

IntegrityHigh

NoneLowHigh

AvailabilityHigh

NoneLowHigh

CVE-2020-12762

✦ Vulnerability Description

Attack Characteristics

Affected Software

Timeline

References

CVSS Score

At a Glance

Official Sources

CVSS v3 Vector

Impact Analysis

Vulnerability Description