Vulnerability-Lookup

CNVD-2021-69944

Vulnerability from cnvd - Published: 2021-09-10

Title

PJSIP竞争条件问题漏洞

Description

PJSIP是一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP中存在竞争条件问题漏洞，该漏洞源于网络系统或产品在运行过程中，并发代码需要互斥地访问共享资源时，对于并发访问的处理不当，攻击者可利用该漏洞导致拒绝服务。

Severity

中

Patch Name

PJSIP竞争条件问题漏洞的补丁

Patch Description

PJSIP是一个免费和开源的多媒体通信库，用C语言编写，实现基于标准的协议，如SIP, SDP, RTP, STUN, TURN，和ICE。 PJSIP中存在竞争条件问题漏洞，该漏洞源于网络系统或产品在运行过程中，并发代码需要互斥地访问共享资源时，对于并发访问的处理不当，攻击者可利用该漏洞导致拒绝服务。目前，供应商发布了安全公告及相关补丁信息，修复了此漏洞。

Formal description

厂商已发布了漏洞修复程序，请及时关注更新： https://github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr

Reference

https://nvd.nist.gov/vuln/detail/CVE-2021-32686

Impacted products

Name
PJSIP PJSIP <2.11.1

Show details on source website

JSON

To clipboard

{
  "cves": {
    "cve": {
      "cveNumber": "CVE-2021-32686"
    }
  },
  "description": "PJSIP\u662f\u4e00\u4e2a\u514d\u8d39\u548c\u5f00\u6e90\u7684\u591a\u5a92\u4f53\u901a\u4fe1\u5e93\uff0c\u7528C\u8bed\u8a00\u7f16\u5199\uff0c\u5b9e\u73b0\u57fa\u4e8e\u6807\u51c6\u7684\u534f\u8bae\uff0c\u5982SIP, SDP, RTP, STUN, TURN\uff0c\u548cICE\u3002\n\nPJSIP\u4e2d\u5b58\u5728\u7ade\u4e89\u6761\u4ef6\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7f51\u7edc\u7cfb\u7edf\u6216\u4ea7\u54c1\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5e76\u53d1\u4ee3\u7801\u9700\u8981\u4e92\u65a5\u5730\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u65f6\uff0c\u5bf9\u4e8e\u5e76\u53d1\u8bbf\u95ee\u7684\u5904\u7406\u4e0d\u5f53\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002",
  "formalWay": "\u5382\u5546\u5df2\u53d1\u5e03\u4e86\u6f0f\u6d1e\u4fee\u590d\u7a0b\u5e8f\uff0c\u8bf7\u53ca\u65f6\u5173\u6ce8\u66f4\u65b0\uff1a\r\nhttps://github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr",
  "isEvent": "\u901a\u7528\u8f6f\u786c\u4ef6\u6f0f\u6d1e",
  "number": "CNVD-2021-69944",
  "openTime": "2021-09-10",
  "patchDescription": "PJSIP\u662f\u4e00\u4e2a\u514d\u8d39\u548c\u5f00\u6e90\u7684\u591a\u5a92\u4f53\u901a\u4fe1\u5e93\uff0c\u7528C\u8bed\u8a00\u7f16\u5199\uff0c\u5b9e\u73b0\u57fa\u4e8e\u6807\u51c6\u7684\u534f\u8bae\uff0c\u5982SIP, SDP, RTP, STUN, TURN\uff0c\u548cICE\u3002\r\n\r\nPJSIP\u4e2d\u5b58\u5728\u7ade\u4e89\u6761\u4ef6\u95ee\u9898\u6f0f\u6d1e\uff0c\u8be5\u6f0f\u6d1e\u6e90\u4e8e\u7f51\u7edc\u7cfb\u7edf\u6216\u4ea7\u54c1\u5728\u8fd0\u884c\u8fc7\u7a0b\u4e2d\uff0c\u5e76\u53d1\u4ee3\u7801\u9700\u8981\u4e92\u65a5\u5730\u8bbf\u95ee\u5171\u4eab\u8d44\u6e90\u65f6\uff0c\u5bf9\u4e8e\u5e76\u53d1\u8bbf\u95ee\u7684\u5904\u7406\u4e0d\u5f53\uff0c\u653b\u51fb\u8005\u53ef\u5229\u7528\u8be5\u6f0f\u6d1e\u5bfc\u81f4\u62d2\u7edd\u670d\u52a1\u3002\u76ee\u524d\uff0c\u4f9b\u5e94\u5546\u53d1\u5e03\u4e86\u5b89\u5168\u516c\u544a\u53ca\u76f8\u5173\u8865\u4e01\u4fe1\u606f\uff0c\u4fee\u590d\u4e86\u6b64\u6f0f\u6d1e\u3002",
  "patchName": "PJSIP\u7ade\u4e89\u6761\u4ef6\u95ee\u9898\u6f0f\u6d1e\u7684\u8865\u4e01",
  "products": {
    "product": "PJSIP PJSIP \u003c2.11.1"
  },
  "referenceLink": "https://nvd.nist.gov/vuln/detail/CVE-2021-32686",
  "serverity": "\u4e2d",
  "submitTime": "2021-07-30",
  "title": "PJSIP\u7ade\u4e89\u6761\u4ef6\u95ee\u9898\u6f0f\u6d1e"
}

CVE-2021-32686 (GCVE-0-2021-32686)

Vulnerability from cvelistv5 – Published: 2021-07-23 00:00 – Updated: 2025-11-04 16:09

Title

Denial of Service in PJSIP

Summary

PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In PJSIP before version 2.11.1, there are a couple of issues found in the SSL socket. First, a race condition between callback and destroy, due to the accepted socket having no group lock. Second, the SSL socket parent/listener may get destroyed during handshake. Both issues were reported to happen intermittently in heavy load TLS connections. They cause a crash, resulting in a denial of service. These are fixed in version 2.11.1.

Severity

5.9 (Medium)


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

CWE

CWE-362 - Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Assigner

GitHub_M mitre root

References

8 references

URL	Tags
https://github.com/pjsip/pjproject/security/advis…
https://github.com/pjsip/pjproject/pull/2716
https://github.com/pjsip/pjproject/commit/d5f95aa…
https://github.com/pjsip/pjproject/releases/tag/2.11.1
https://www.debian.org/security/2021/dsa-4999	vendor-advisory
https://lists.debian.org/debian-lts-announce/2022…	mailing-list
https://security.gentoo.org/glsa/202210-37	vendor-advisory
https://lists.debian.org/debian-lts-announce/2024…

Impacted products

1 product

Vendor	Product	Version
pjsip	pjproject	Affected: < 2.11.1

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "providerMetadata": {
          "dateUpdated": "2025-11-04T16:09:14.172Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
          "shortName": "CVE"
        },
        "references": [
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/pjsip/pjproject/pull/2716"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/pjsip/pjproject/commit/d5f95aa066f878b0aef6a64e60b61e8626e664cd"
          },
          {
            "tags": [
              "x_transferred"
            ],
            "url": "https://github.com/pjsip/pjproject/releases/tag/2.11.1"
          },
          {
            "name": "DSA-4999",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://www.debian.org/security/2021/dsa-4999"
          },
          {
            "name": "[debian-lts-announce] 20220328 [SECURITY] [DLA 2962-1] pjproject security update",
            "tags": [
              "mailing-list",
              "x_transferred"
            ],
            "url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html"
          },
          {
            "name": "GLSA-202210-37",
            "tags": [
              "vendor-advisory",
              "x_transferred"
            ],
            "url": "https://security.gentoo.org/glsa/202210-37"
          },
          {
            "url": "https://lists.debian.org/debian-lts-announce/2024/09/msg00030.html"
          }
        ],
        "title": "CVE Program Container"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "pjproject",
          "vendor": "pjsip",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 2.11.1"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "PJSIP is a free and open source multimedia communication library written in C language implementing standard based protocols such as SIP, SDP, RTP, STUN, TURN, and ICE. In PJSIP before version 2.11.1, there are a couple of issues found in the SSL socket. First, a race condition between callback and destroy, due to the accepted socket having no group lock. Second, the SSL socket parent/listener may get destroyed during handshake. Both issues were reported to happen intermittently in heavy load TLS connections. They cause a crash, resulting in a denial of service. These are fixed in version 2.11.1."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "HIGH",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 5.9,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-362",
              "description": "CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization (\u0027Race Condition\u0027)",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2022-10-31T00:00:00.000Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "url": "https://github.com/pjsip/pjproject/security/advisories/GHSA-cv8x-p47p-99wr"
        },
        {
          "url": "https://github.com/pjsip/pjproject/pull/2716"
        },
        {
          "url": "https://github.com/pjsip/pjproject/commit/d5f95aa066f878b0aef6a64e60b61e8626e664cd"
        },
        {
          "url": "https://github.com/pjsip/pjproject/releases/tag/2.11.1"
        },
        {
          "name": "DSA-4999",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://www.debian.org/security/2021/dsa-4999"
        },
        {
          "name": "[debian-lts-announce] 20220328 [SECURITY] [DLA 2962-1] pjproject security update",
          "tags": [
            "mailing-list"
          ],
          "url": "https://lists.debian.org/debian-lts-announce/2022/03/msg00035.html"
        },
        {
          "name": "GLSA-202210-37",
          "tags": [
            "vendor-advisory"
          ],
          "url": "https://security.gentoo.org/glsa/202210-37"
        }
      ],
      "source": {
        "advisory": "GHSA-cv8x-p47p-99wr",
        "discovery": "UNKNOWN"
      },
      "title": "Denial of Service in PJSIP"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2021-32686",
    "datePublished": "2021-07-23T00:00:00.000Z",
    "dateReserved": "2021-05-12T00:00:00.000Z",
    "dateUpdated": "2025-11-04T16:09:14.172Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

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.

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CNVD-2021-69944

CVE-2021-32686 (GCVE-0-2021-32686)

Tags

Sightings

Nomenclature

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