PT-2021-11857 · Sangoma+1 · Asterisk+1

Ipoddubny + 1 · Published 2021-02-18 · Updated 2025-02-13 · CVE-2020-35776

Positive Technologies (AI Summary)

CVSS v3.1

6.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions: Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1

Description: A buffer overflow in the res pjsip diversion.c file allows a remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.

Recommendations: For versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1, consider updating to a newer version to mitigate the risk. As a temporary workaround, consider restricting access to the res pjsip diversion.c module to minimize the risk of exploitation.

Exploit

Fix

Buffer Overflow

Weakness Enumeration

CWE-120

Related Identifiers

ALT-PU-2023-6874

ALT-PU-2025-2613

CVE-2020-35776

Affected Products

Alt Linux

Asterisk

References · 15

• 🔥 https://issues.asterisk.org/jira/browse/ASTERISK-29227 · Exploit
• https://osv.dev/vulnerability/DEBIAN-CVE-2020-35776 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2020-35776 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2020-35776 · Vendor Advisory
• https://issues.asterisk.org · Vendor Advisory
• https://osv.dev/vulnerability/ALPINE-CVE-2020-35776 · Vendor Advisory
• https://ubuntu.com/security/CVE-2020-35776 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2020-35776 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2020-35776 · Vendor Advisory
• https://downloads.asterisk.org/pub/security/AST-2021-001.html · Vendor Advisory
• http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2020-35776 · Security Note
• https://security.alpinelinux.org/vuln/CVE-2020-35776 · Note
• https://t.me/cibsecurity/23830 · Telegram Post
• http://seclists.org/fulldisclosure/2021/Feb/57 · Note