What is CVE-2020-12762?

CVE-2020-12762 is a high-severity software vulnerability (Integer overflow) with a CVSS score of 7.8. json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.

Is CVE-2020-12762 being actively exploited?

It is not currently in CISA's KEV catalog. Its EPSS exploitation probability is 2%.

What products does CVE-2020-12762 affect?

Tracked products affected include Ubuntu, Debian, Fedora. Check the version you run to see whether it is affected.

How do I fix CVE-2020-12762?

Apply the vendor fix promptly. An official patch or advisory is available. Upgrade affected products to a fixed version.

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CVE-2020-12762

HIGH severity · CVSS 7.8 · Integer overflow

7.8CVSS HIGH

Summary

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

Impact & exploitability

Attack vectorLocal

Attack complexityLow

Privileges requiredNone

User interactionRequired

Confidentiality impactHigh

Integrity impactHigh

Availability impactHigh

Exploit probability (EPSS)2%

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

Affected products we track (3)

Ubuntu Debian Fedora

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://github.com/json-c/json-c/pull/592 ↗

Additional information

NVD record
https://github.com/json-c/json-c/pull/592Patch
https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdfAdvisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00032.htmlAdvisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00034.htmlAdvisory
https://lists.debian.org/debian-lts-announce/2020/07/msg00031.htmlAdvisory
https://lists.debian.org/debian-lts-announce/2023/06/msg00023.htmlAdvisory
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBR36IXYBHITAZFB5PFBJTED22WO5ONB/
https://github.com/rsyslog/libfastjson/issues/161Advisory