What is the CVSS score of CVE-2021-43845?

CVE-2021-43845 has a CVSS 3.1 base score of 9.1 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H. EPSS exploitation probability: 3.7%.

Is there a public PoC exploit available for CVE-2021-43845?

Yes, a public proof-of-concept exploit is available for CVE-2021-43845. Prioritise patching immediately. EPSS: 3.7%.

Is there a patch available for CVE-2021-43845?

Yes, a patch is available for CVE-2021-43845. Update the affected software to the latest version immediately.

Pjsip CVE-2021-43845

CRITICAL

Out-of-bounds Read (CWE-125)

2021-12-27 security-advisories@github.com

Buffer Overflow Information Disclosure Pjsip Debian Linux

9.1

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

9.1 CRITICAL

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

None

Availability

High

Lifecycle Timeline

CVE Published

Dec 27, 2021 - 18:15 nvd

CRITICAL 9.1

DescriptionNVD

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.

AnalysisAI

PJSIP is a free and open source multimedia communication library. Rated critical severity (CVSS 9.1), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Public exploit code available.

Technical ContextAI

This vulnerability is classified as Out-of-bounds Read (CWE-125), which allows attackers to read data from memory outside the intended buffer boundaries. 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. Affected products include: Teluu Pjsip, Debian Debian Linux. Version information: version 2.11.1.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Validate array indices and buffer lengths. Use memory-safe languages. Enable AddressSanitizer during testing.