HIGH
CVE-2020-12762
CWE-190Published: May 9, 2020· Updated: Jun 17, 2026
7.8
CVSS v3.1
Official 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.
Technical Analysis
CVE-2020-12762 requires local access, meaning attackers must already have a foothold on the target system.
Exploitation does not require any privileges, though user interaction (Required) is needed, which slightly reduces the risk of mass automated attacks.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 7.8.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorLocal
Attack ComplexityLow
Privileges Req.None
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Affected Vendors & Products
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
ADVISORYhttps://usn.ubuntu.com/4360-1/
ADVISORYhttps://usn.ubuntu.com/4360-4/
ADVISORYhttps://usn.ubuntu.com/4360-1/
ADVISORYhttps://usn.ubuntu.com/4360-4/
All References (31)
→
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://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
Quick Facts
CVE IDCVE-2020-12762
CVSS Score7.8 / 10
SeverityHIGH
WeaknessCWE-190
CISA KEVNo
Affected5 vendor(s)
PublishedMay 9, 2020
Related CVEs (CWE-190)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2020-12762 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.