6.5
MEDIUM
CVE-2021-21375
PJSIP Denial of Service (DoS) Crash
Description

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 version 2.10 and earlier, after an initial INVITE has been sent, when two 183 responses are received, with the first one causing negotiation failure, a crash will occur. This results in a denial of service.

INFO

Published Date :

March 10, 2021, 11:15 p.m.

Last Modified :

Oct. 21, 2022, 10:40 p.m.

Remotely Exploitable :

Yes !

Impact Score :

3.6

Exploitability Score :

2.8
Affected Products

The following products are affected by CVE-2021-21375 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Debian debian_linux
1 Teluu pjsip
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2021-21375.

URL Resource
https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365 Patch Third Party Advisory
https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp Exploit Patch Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html Mailing List Third Party Advisory
https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html Mailing List Third Party Advisory
https://security.gentoo.org/glsa/202107-42 Third Party Advisory

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2021-21375 vulnerability anywhere in the article.

The following table lists the changes that have been made to the CVE-2021-21375 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • Reanalysis by [email protected]

    Oct. 21, 2022

    Action Type Old Value New Value
    Removed CWE NIST CWE-400
    Added CWE NIST CWE-754
  • Modified Analysis by [email protected]

    Sep. 02, 2021

    Action Type Old Value New Value
    Changed Reference Type https://security.gentoo.org/glsa/202107-42 No Types Assigned https://security.gentoo.org/glsa/202107-42 Third Party Advisory
    Added CWE NIST CWE-400
    Changed CPE Configuration OR *cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:* versions up to (including) 2.1.0 OR *cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:* versions up to (including) 2.10
  • CVE Modified by [email protected]

    Jul. 20, 2021

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/202107-42 [No Types Assigned]
  • Modified Analysis by [email protected]

    May. 26, 2021

    Action Type Old Value New Value
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html Mailing List, Third Party Advisory
    Changed Reference Type https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html No Types Assigned https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html Mailing List, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • CVE Modified by [email protected]

    May. 23, 2021

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2021/05/msg00020.html [No Types Assigned]
  • CVE Modified by [email protected]

    Apr. 23, 2021

    Action Type Old Value New Value
    Added Reference https://lists.debian.org/debian-lts-announce/2021/04/msg00023.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Mar. 18, 2021

    Action Type Old Value New Value
    Added CVSS V2 Metadata Victim must voluntarily interact with attack mechanism
    Added CVSS V2 NIST (AV:N/AC:M/Au:N/C:N/I:N/A:P)
    Added CVSS V3.1 NIST AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
    Changed Reference Type https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365 No Types Assigned https://github.com/pjsip/pjproject/commit/97b3d7addbaa720b7ddb0af9bf6f3e443e664365 Patch, Third Party Advisory
    Changed Reference Type https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp No Types Assigned https://github.com/pjsip/pjproject/security/advisories/GHSA-hvq6-f89p-frvp Exploit, Patch, Third Party Advisory
    Added CPE Configuration OR *cpe:2.3:a:teluu:pjsip:*:*:*:*:*:*:*:* versions up to (including) 2.1.0
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2021-21375 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2021-21375 weaknesses.

Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

0.21 }} 0.06%

score

0.58975

percentile

CVSS31 - Vulnerability Scoring System
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability