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CVE-2021-46837

Published: Aug 30, 2022Updated: Nov 21, 2024 Sources: CVE List NVDCWE-476
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
1.8%
Top 25.0%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-476

Affected Products

n/an/a
certified asteriskasterisk
On-prem
Communications / voip-telephony
asteriskdigiumCommunications
debian linuxdebian
On-premOS
Operating Systems / linux-distro
asteriskoss-projectCommunicationsaka open source, asterisk appliance developer kit
digiumcommercialUSCommunicationsaka digium, asterisk
debianoss-projectGBOperating Systemsaka debian gnu/linux

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Impact
Initial Access
View detailed technique mapping

References

https://downloads.asterisk.org/pub/security/AST-2021-006.html
downloads.asterisk.org
https://lists.debian.org/debian-lts-announce/2022/11/msg00021.html
lists.debian.org
https://www.debian.org/security/2022/dsa-5285
debian.org

Timeline

Published
Aug 30, 2022
Last Updated
Nov 21, 2024

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