CVE-2020-35776

MEDIUM EPSS 89.0%
Published Feb 18, 20215y ago · Modified Jun 17, 20262w ago
6.5 CVSS 3.1
Medium
Find Similar
Published Feb 18, 2021 5y ago
Last Modified Jun 17, 2026 2w ago

Description

A buffer overflow in res_pjsip_diversion.c in Sangoma Asterisk versions 13.38.1, 16.15.1, 17.9.1, and 18.1.1 allows remote attacker to crash Asterisk by deliberately misusing SIP 181 responses.

CVSS Details

Base Score
6.5
Exploitability
2.8
Impact
3.6
Vector string
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
89.0% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 1

CWE-120

Affected Products 4

VendorProductVersionRange
digiumasterisk*≥13.0.0  –  ≤13.38.1
digiumasterisk*≥16.0.0  –  ≤16.15.1
digiumasterisk*≥17.0.0  –  ≤17.9.1
digiumasterisk*≥18.0  –  ≤18.1.1

References 5

  • packetstormsecurity.com http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
    PatchThird Party Advisory
  • seclists.org http://seclists.org/fulldisclosure/2021/Feb/57
    Mailing ListThird Party Advisory
  • downloads.asterisk.org https://downloads.asterisk.org/pub/security/AST-2021-001.html
    Vendor Advisory
  • issues.asterisk.org https://issues.asterisk.org/
    Issue TrackingVendor Advisory
  • issues.asterisk.org https://issues.asterisk.org/jira/browse/ASTERISK-29227
    ExploitIssue TrackingPatchVendor Advisory

Remediation

  • packetstormsecurity.com http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.html
    PatchThird Party Advisory
  • issues.asterisk.org https://issues.asterisk.org/jira/browse/ASTERISK-29227
    ExploitIssue TrackingPatchVendor Advisory