CVE-2020-12762

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Summary

CVECVE-2020-12762
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2020-05-09 18:15:11 UTC
Updated2026-10-14 10:17:26 UTC
Descriptionjson-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from [email protected]

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

Problem Types: CWE-190 | CWE-787 | n/a | CWE-787 CWE-787 Out-of-bounds Write

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1ADPDECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
2.0[email protected]Primary6.8AV:N/AC:M/Au:N/C:P/I:P/A:P

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
Partial
Integrity
Partial
Availability
Partial

AV:N/AC:M/Au:N/C:P/I:P/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Canonical Ubuntu Linux 12.04 All All All
Operating System Canonical Ubuntu Linux 14.04 All All All
Operating System Canonical Ubuntu Linux 16.04 All All All
Operating System Canonical Ubuntu Linux 18.04 All All All
Operating System Canonical Ubuntu Linux 19.10 All All All
Operating System Canonical Ubuntu Linux 20.04 All All All
Operating System Debian Debian Linux 10.0 All All All
Operating System Debian Debian Linux 8.0 All All All
Operating System Debian Debian Linux 9.0 All All All
Operating System Fedoraproject Fedora 30 All All All
Operating System Fedoraproject Fedora 31 All All All
Operating System Fedoraproject Fedora 32 All All All
Application Json-c Json-c All All All All
Application Siemens Sinec Ins - All All All
Application Siemens Sinec Ins 1.0 - All All
Application Siemens Sinec Ins 1.0 sp1 All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens SIMATIC S7-1500 TM MFP - GNU/Linux Subsystem affected V1.1 custom Not specified
ADP Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP affected V3.1.0 V3.1.5 custom Not specified
ADP Siemens RUGGEDCOM ROX MX5000 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX MX5000RE affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1400 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1500 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1501 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1510 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1511 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1512 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1524 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX1536 affected V2.17.0 custom Not specified
ADP Siemens RUGGEDCOM ROX RX5000 affected V2.17.0 custom Not specified

References

ReferenceSourceLinkTags
cert-portal.siemens.com/productcert/html/ssa-398330.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
[SECURITY] Fedora 31 Update: json-c-0.13.1-12.fc31 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
json-c: Multiple vulnerabilities (GLSA 202006-13) — Gentoo security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-637483.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
lists.debian.org/debian-lts-announce/2025/07/msg00021.html af854a3a-2127-422b-91ae-364da2661108 lists.debian.org
[SECURITY] [DLA 2301-1] json-c security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
USN-4360-1: json-c vulnerability | Ubuntu security notices af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com Third Party Advisory
[SECURITY] [DLA 2228-2] json-c regression update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
Prevent out of boundary write on malicious input by stoeckmann · Pull Request #592 · json-c/json-c · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Patch, Third Party Advisory
cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com Third Party Advisory
Please check if affected by CVE-2020-12762 · Issue #161 · rsyslog/libfastjson · GitHub af854a3a-2127-422b-91ae-364da2661108 github.com Exploit, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-202008.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
[SECURITY] Fedora 32 Update: json-c-0.13.1-12.fc32 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[SECURITY] [DLA 2228-1] json-c security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Mailing List, Third Party Advisory
cert-portal.siemens.com/productcert/html/ssa-794697.html 0b142b55-0307-4c5a-b3c9-f314f3fb7c5e cert-portal.siemens.com
USN-4360-4: json-c vulnerability | Ubuntu security notices | Ubuntu af854a3a-2127-422b-91ae-364da2661108 usn.ubuntu.com Third Party Advisory
[SECURITY] [DLA 3461-1] libfastjson security update af854a3a-2127-422b-91ae-364da2661108 lists.debian.org Third Party Advisory
Debian -- Security Information -- DSA-4741-1 json-c af854a3a-2127-422b-91ae-364da2661108 www.debian.org Third Party Advisory
[SECURITY] Fedora 30 Update: json-c-0.13.1-12.fc30 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
CVE-2020-12762 JSON-C Vulnerability in NetApp Products | NetApp Product Security af854a3a-2127-422b-91ae-364da2661108 security.netapp.com Third Party Advisory
[SECURITY] Fedora 32 Update: json-c-0.13.1-12.fc32 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 31 Update: json-c-0.13.1-12.fc31 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 30 Update: json-c-0.13.1-12.fc30 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 159500 Oracle Enterprise Linux Security Update for json-c (ELSA-2021-4382)
  • 161097 Oracle Enterprise Linux Security Update for libfastjson (ELSA-2023-6431)
  • 161149 Oracle Enterprise Linux Security Update for libfastjson (ELSA-2023-6976)
  • 239843 Red Hat Update for json-c (RHSA-2021:4382)
  • 242315 Red Hat Update for libfastjson (RHSA-2023:6431)
  • 242417 Red Hat Update for libfastjson (RHSA-2023:6976)
  • 242798 Red Hat Update for libfastjson (RHSA-2024:0573)
  • 242856 Red Hat Update for libfastjson (RHSA-2024:0411)
  • 243006 Red Hat Update for libfastjson (RHSA-2024:1086)
  • 243036 Red Hat Update for libfastjson (RHSA-2024:1154)
  • 285315 Fedora Security Update for libfastjson (FEDORA-2023-bf3b135831)
  • 355395 Amazon Linux Security Advisory for libfastjson : ALAS2-2023-2079
  • 355406 Amazon Linux Security Advisory for libfastjson : ALAS2023-2023-205
  • 355466 Amazon Linux Security Advisory for json-c : ALAS2023-2023-232
  • 500271 Alpine Linux Security Update for json-c
  • 502998 Alpine Linux Security Update for libfastjson
  • 504035 Alpine Linux Security Update for json-c
  • 591406 Siemens SIMATIC S7-1500 CPU GNU/Linux subsystem Multiple Vulnerabilities (SSB-439005, ICSA-22-104-13)
  • 6000157 Debian Security Update for libfastjson (DLA 3461-1)
  • 673952 EulerOS Security Update for libfastjson (EulerOS-SA-2023-2649)
  • 674018 EulerOS Security Update for libfastjson (EulerOS-SA-2023-2691)
  • 751650 SUSE Enterprise Linux Security Update for json-c (SUSE-SU-2022:0184-1)
  • 751660 OpenSUSE Security Update for json-c (openSUSE-SU-2022:0184-1)
  • 751756 OpenSUSE Security Update for json-c (openSUSE-SU-2022:0184-2)
  • 752541 SUSE Enterprise Linux Security Update for json-c (SUSE-SU-2022:3001-1)
  • 900077 CBL-Mariner Linux Security Update for json-c 0.14
  • 901250 Common Base Linux Mariner (CBL-Mariner) Security Update for json-c (6506-1)
  • 902923 Common Base Linux Mariner (CBL-Mariner) Security Update for json-c (1949)
  • 940230 AlmaLinux Security Update for json-c (ALSA-2021:4382)
  • 941379 AlmaLinux Security Update for libfastjson (ALSA-2023:6431)
  • 941452 AlmaLinux Security Update for libfastjson (ALSA-2023:6976)
  • 960841 Rocky Linux Security Update for json-c (RLSA-2021:4382)

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