Vulnerability-Lookup

CVE-2020-12762 (GCVE-0-2020-12762)

Vulnerability from cvelistv5 – Published: 2020-05-09 00:00 – Updated: 2025-11-03 19:25

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.

Severity

7.8 (High)


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

SSVC

Exploitation: none Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2025-05-30 19:18 UTC

CWE

n/a
CWE-787 - Out-of-bounds Write

Assigner

mitre mitre root

References

16 references

URL	Tags
https://github.com/json-c/json-c/pull/592
https://github.com/rsyslog/libfastjson/issues/161
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://usn.ubuntu.com/4360-1/	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.fedoraproject.org/archives/list/pac…	vendor-advisory
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://usn.ubuntu.com/4360-4/	vendor-advisory
https://security.gentoo.org/glsa/202006-13	vendor-advisory
https://lists.debian.org/debian-lts-announce/2020…	mailing-list
https://www.debian.org/security/2020/dsa-4741	vendor-advisory
https://security.netapp.com/advisory/ntap-2021052…
https://cert-portal.siemens.com/productcert/pdf/s…
https://lists.debian.org/debian-lts-announce/2023…	mailing-list
https://lists.debian.org/debian-lts-announce/2025…

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      "current_release_date": "2026-06-26T22:35:25+00:00",
      "cve": "CVE-2020-12762",
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      "initial_release_date": "2020-05-02T00:00:00+00:00",
      "product_status:fixed": "140",
      "product_status:known_affected": "7",
      "product_status:known_not_affected": "3",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "libfastjson: integer overflow and out-of-bounds write via a large JSON file",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2020/cve-2020-12762.json",
      "version": "3"
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      "cveMetadata": "{\"cveId\": \"CVE-2020-12762\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2025-11-03T19:25:29.557Z\", \"dateReserved\": \"2020-05-09T00:00:00.000Z\", \"assignerOrgId\": \"8254265b-2729-46b6-b9e3-3dfca2d5bfca\", \"datePublished\": \"2020-05-09T00:00:00.000Z\", \"assignerShortName\": \"mitre\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}

GHSA-3797-GMJF-45GM

Vulnerability from github – Published: 2022-05-24 17:17 – Updated: 2025-11-03 21:30

Details

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

Severity

7.8 (High)


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

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2020-12762"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-190",
      "CWE-787"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-05-09T18:15:00Z",
    "severity": "MODERATE"
  },
  "details": "json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.",
  "id": "GHSA-3797-gmjf-45gm",
  "modified": "2025-11-03T21:30:31Z",
  "published": "2022-05-24T17:17:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12762"
    },
    {
      "type": "WEB",
      "url": "https://github.com/rsyslog/libfastjson/issues/161"
    },
    {
      "type": "WEB",
      "url": "https://github.com/json-c/json-c/pull/592"
    },
    {
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      "url": "https://www.debian.org/security/2020/dsa-4741"
    },
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      "url": "https://usn.ubuntu.com/4360-4"
    },
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      "url": "https://usn.ubuntu.com/4360-1"
    },
    {
      "type": "WEB",
      "url": "https://security.netapp.com/advisory/ntap-20210521-0001"
    },
    {
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      "url": "https://security.gentoo.org/glsa/202006-13"
    },
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      "type": "WEB",
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    },
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      "type": "WEB",
      "url": "https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/CBR36IXYBHITAZFB5PFBJTED22WO5ONB"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2025/07/msg00021.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2023/06/msg00023.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/07/msg00031.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/05/msg00034.html"
    },
    {
      "type": "WEB",
      "url": "https://lists.debian.org/debian-lts-announce/2020/05/msg00032.html"
    },
    {
      "type": "WEB",
      "url": "https://cert-portal.siemens.com/productcert/pdf/ssa-637483.pdf"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GSD-2020-12762

Vulnerability from gsd - Updated: 2023-12-13 01:21

Details

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

Aliases

CVE-2020-12762

Aliases

CVE-2020-12762

JSON

To clipboard

{
  "GSD": {
    "alias": "CVE-2020-12762",
    "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.",
    "id": "GSD-2020-12762",
    "references": [
      "https://www.suse.com/security/cve/CVE-2020-12762.html",
      "https://www.debian.org/security/2020/dsa-4741",
      "https://access.redhat.com/errata/RHSA-2021:4382",
      "https://ubuntu.com/security/CVE-2020-12762",
      "https://advisories.mageia.org/CVE-2020-12762.html",
      "https://security.archlinux.org/CVE-2020-12762",
      "https://alas.aws.amazon.com/cve/html/CVE-2020-12762.html",
      "https://linux.oracle.com/cve/CVE-2020-12762.html"
    ]
  },
  "gsd": {
    "metadata": {
      "exploitCode": "unknown",
      "remediation": "unknown",
      "reportConfidence": "confirmed",
      "type": "vulnerability"
    },
    "osvSchema": {
      "aliases": [
        "CVE-2020-12762"
      ],
      "details": "json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.",
      "id": "GSD-2020-12762",
      "modified": "2023-12-13T01:21:49.265064Z",
      "schema_version": "1.4.0"
    }
  },
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        "STATE": "PUBLIC"
      },
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                    "version": {
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            "refsource": "FEDORA",
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      },
      "impact": {
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          "acInsufInfo": false,
          "cvssV2": {
            "accessComplexity": "MEDIUM",
            "accessVector": "NETWORK",
            "authentication": "NONE",
            "availabilityImpact": "PARTIAL",
            "baseScore": 6.8,
            "confidentialityImpact": "PARTIAL",
            "integrityImpact": "PARTIAL",
            "vectorString": "AV:N/AC:M/Au:N/C:P/I:P/A:P",
            "version": "2.0"
          },
          "exploitabilityScore": 8.6,
          "impactScore": 6.4,
          "obtainAllPrivilege": false,
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          "severity": "MEDIUM",
          "userInteractionRequired": true
        },
        "baseMetricV3": {
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            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 1.8,
          "impactScore": 5.9
        }
      },
      "lastModifiedDate": "2023-09-25T02:30Z",
      "publishedDate": "2020-05-09T18:15Z"
    }
  }
}

ICSA-22-258-05

Vulnerability from csaf_cisa - Published: 2022-09-13 00:00 - Updated: 2022-09-13 00:00

Summary

Siemens SINEC INS

Scope

14 vulnerabilities in this advisory, including CVE-2020-12762.

CVE-2020-12762

7.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Known affected: 1 product

https://support.industry.siemens.com/cs/ww/en/view/109812610/

Open the full advisory

ICSA-23-166-11

Vulnerability from csaf_cisa - Published: 2023-06-13 00:00 - Updated: 2024-04-09 00:00

Summary

Siemens SIMATIC S7-1500 TM MFP Linux Kernel

Scope

168 vulnerabilities in this advisory, including CVE-2020-12762.

CVE-2020-12762

7.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Known affected: 1 product

https://support.industry.siemens.com/cs/ww/en/view/109827684/

Open the full advisory

ICSA-23-348-10

Vulnerability from csaf_cisa - Published: 2023-12-12 00:00 - Updated: 2025-08-12 00:00

Summary

Siemens SIMATIC S7-1500

Scope

544 vulnerabilities in this advisory, including CVE-2020-12762.

CVE-2020-12762

7.8 (High)


                
                  CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:P/RL:O/RC:C

Known affected: 5 products

https://support.industry.siemens.com/cs/ww/en/view/109478459/

Open the full advisory

MSRC_CVE-2020-12762

Vulnerability from csaf_microsoft - Published: 2020-05-02 00:00 - Updated: 2021-12-16 00:00

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.

Scope

1 vulnerability in this advisory, including CVE-2020-12762.

CVE-2020-12762

7.8 (High)


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

Fixed: 2 products Known affected: 2 products

https://learn.microsoft.com/en-us/azure/azure-linux/tutoria…

Open the full advisory

NCSC-2025-0382

Vulnerability from csaf_ncscnl - Published: 2025-12-09 13:15 - Updated: 2025-12-09 13:15

Summary

Kwetsbaarheden verholpen in Siemens producten

Scope

124 vulnerabilities in this advisory, including CVE-2020-12762.

CVE-2020-12762

Red Hat Enterprise Linux and its components, including json-c and libfastjson, have multiple vulnerabilities, particularly an integer overflow and out-of-bounds write issue (CVE-2020-12762) affecting large JSON files, allowing potential arbitrary code execution.

7.8 (High)


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

Known affected: 32 products

Open the full advisory

oesa-2023-1186

Vulnerability from osv_openeuler

Published

2023-03-31 11:05

Modified

2026-08-06 11:05

Summary

libfastjson security update

Details

libfastjson is a fork from json-c, and is currently under development. The aim of this is not to provide a slightly modified clone of json-c. It's aim is to provide: a small library with essential json handling functions, sufficiently good json support (not 100% standards compliant), be very fast in processing.

Security Fix(es):

json-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.(CVE-2020-12762)

Severity

7.8 (High)


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

References

URL

Type

	https://www.openeuler.org/en/security/safety-bull…	ADVISORY
	https://nvd.nist.gov/vuln/detail/CVE-2020-12762	ADVISORY

JSON

To clipboard

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    "severity": "High"
  },
  "details": "libfastjson is a fork from json-c, and is currently under development. The aim of this is not to provide a slightly modified clone of json-c. It\u0026apos;s aim is to provide: a small library with essential json handling functions, sufficiently good json support (not 100% standards compliant), be very fast in processing.\r\n\r\nSecurity Fix(es):\r\n\r\njson-c through 0.14 has an integer overflow and out-of-bounds write via a large JSON file, as demonstrated by printbuf_memappend.(CVE-2020-12762)",
  "id": "OESA-2023-1186",
  "modified": "2026-08-06T11:05:39Z",
  "published": "2023-03-31T11:05:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.openeuler.org/en/security/safety-bulletin/detail.html?id=openEuler-SA-2023-1186"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12762"
    }
  ],
  "schema_version": "1.7.2",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "libfastjson security update",
  "upstream": [
    "CVE-2020-12762"
  ]
}

OPENSUSE-SU-2022:0184-1

Vulnerability from csaf_opensuse - Published: 2022-01-25 17:21 - Updated: 2022-01-25 17:21

Summary

Security update for json-c

Severity

Important

Scope

1 vulnerability in this advisory, including CVE-2020-12762.

CVE-2020-12762

7.8 (High)


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

Recommended: 10 products

Open the full advisory

OPENSUSE-SU-2024:12911-1

Vulnerability from csaf_opensuse - Published: 2024-06-15 00:00 - Updated: 2024-06-15 00:00

Summary

libfastjson-devel-1.2304.0-1.1 on GA media

Severity

Moderate

Scope

1 vulnerability in this advisory, including CVE-2020-12762.

CVE-2020-12762

7.8 (High)


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

Recommended: 8 products

Open the full advisory

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2020-12762 (GCVE-0-2020-12762)

Vulnerability from osv_openeuler

Tags

Sightings

Nomenclature

Related by attack behaviour