CVE-2020-35776
MEDIUMCVSS 6.5/10EPSS 3.91%
Last modified
CVE-2020-35776 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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.. EPSS estimates a 3.91% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Digium | Asterisk | >= 13.0.0, <= 13.38.1 |
| Digium | Asterisk | >= 16.0.0, <= 16.15.1 |
| Digium | Asterisk | >= 17.0.0, <= 17.9.1 |
| Digium | Asterisk | >= 18.0, <= 18.1.1 |
References
- http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.htmlPatch, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Feb/57Mailing List, Third Party Advisory
- https://issues.asterisk.org/Issue Tracking, Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29227Exploit, Issue Tracking, Patch, Vendor Advisory
- http://packetstormsecurity.com/files/161470/Asterisk-Project-Security-Advisory-AST-2021-001.htmlPatch, Third Party Advisory
- http://seclists.org/fulldisclosure/2021/Feb/57Mailing List, Third Party Advisory
- https://issues.asterisk.org/Issue Tracking, Vendor Advisory
- https://issues.asterisk.org/jira/browse/ASTERISK-29227Exploit, Issue Tracking, Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-35776?
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.
How severe is CVE-2020-35776?
CVE-2020-35776 has a CVSS score of 6.5/10 (MEDIUM severity). The EPSS model estimates a 3.91% probability of exploitation in the next 30 days.
How do I fix CVE-2020-35776?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2020-35776?
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Scan your code nowSource: NVD / NIST