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CVE-2021-43845— Prevent out-of-bounds read in PJSIP

Quick assessment

Affected
pjsip pjproject
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 2.11.1及之前版本存在缓冲区错误漏洞，该漏洞源于如果传入RTCP XR消息包含块，则不会根据接收到的数据包大小检查数据字段，可能导致越界读取访问。

CVSS 8.2 · High EPSS 3.62% · P89

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2021-43845

Vulnerability Information
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Vulnerability Title
Prevent out-of-bounds read in PJSIP
Source: CVE Program / CVE List V5
Vulnerability Description
PJSIP is a free and open source multimedia communication library. In version 2.11.1 and prior, if incoming RTCP XR message contain block, the data field is not checked against the received packet size, potentially resulting in an out-of-bound read access. This affects all users that use PJMEDIA and RTCP XR. A malicious actor can send a RTCP XR message with an invalid packet size.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存读
Source: CVE Program / CVE List V5
Vulnerability Title
PJSIP 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability 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 2.11.1及之前版本存在缓冲区错误漏洞，该漏洞源于如果传入RTCP XR消息包含块，则不会根据接收到的数据包大小检查数据字段，可能导致越界读取访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
pjsip pjproject <= 2.11.1 -

II. Public POCs for CVE-2021-43845

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III. Intelligence Information for CVE-2021-43845

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Patches & Fixes for CVE-2021-43845 (2)

Vendor Advisories for CVE-2021-43845 (3)

Mailing List Discussions for CVE-2021-43845 (3)

IV. Related Vulnerabilities

Same product: pjproject
Same vendor: pjsip
Same weakness: CWE-125

V. Comments for CVE-2021-43845

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