CVE-2020-12762

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.90% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 78.1% of scored records. A rank, not a probability.

NVD base score

7.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

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

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-05-09 00:00Z6 YR AGO

Last updated

2025-11-03 19:25Z10 MO AGO

Reserved

2020-05-09

Assigning CNA

mitre

Record state

PUBLISHED

Severity

High (CVSS 7.8)

CNA CVSS vector

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

Weaknesses

• CWE-787Out-of-bounds WriteBase
• CWE-190Integer Overflow or WraparoundBase

Data version

5.2

Document digest

ecee3dea5c8fb968e01f0d5c61fdf151a610eddf0f31f620dc65714ce67a6785

• github.comhttps://github.com/json-c/json-c/pull/592
• github.comhttps://github.com/rsyslog/libfastjson/issues/161
• lists.fedoraproject.orgFEDORA-2020-63c6f4ab1dhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CQQRRGBQCAWNCCJ2HN3W5SSCZ4QGMXQI/vendor-advisory
• usn.ubuntu.comUSN-4360-1https://usn.ubuntu.com/4360-1/vendor-advisory
• lists.fedoraproject.orgFEDORA-2020-847ad856abhttps://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBR36IXYBHITAZFB5PFBJTED22WO5ONB/vendor-advisory
• lists.fedoraproject.orgFEDORA-2020-7eb7eac270https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/W226TSCJBEOXDUFVKNWNH7ETG7AR6MCS/vendor-advisory
• lists.debian.org[debian-lts-announce] 20200531 [SECURITY] [DLA 2228-1] json-c security updatehttps://lists.debian.org/debian-lts-announce/2020/05/msg00032.htmlmailing-list
• lists.debian.org[debian-lts-announce] 20200531 [SECURITY] [DLA 2228-2] json-c regression updatehttps://lists.debian.org/debian-lts-announce/2020/05/msg00034.htmlmailing-list
• usn.ubuntu.comUSN-4360-4https://usn.ubuntu.com/4360-4/vendor-advisory
• security.gentoo.orgGLSA-202006-13https://security.gentoo.org/glsa/202006-13vendor-advisory
• lists.debian.org[debian-lts-announce] 20200730 [SECURITY] [DLA 2301-1] json-c security updatehttps://lists.debian.org/debian-lts-announce/2020/07/msg00031.htmlmailing-list
• www.debian.orgDSA-4741https://www.debian.org/security/2020/dsa-4741vendor-advisory
• security.netapp.comhttps://security.netapp.com/advisory/ntap-20210521-0001/
• cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf
• lists.debian.org[debian-lts-announce] 20230620 [SECURITY] [DLA 3461-1] libfastjson security updatehttps://lists.debian.org/debian-lts-announce/2023/06/msg00023.htmlmailing-list
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/07/msg00021.html