CVE-2021-26713: Buffer Overflow
First published: Fri Feb 19 2021(Updated: )
A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Digium Asterisk | >=16.0.0<16.16.1 | |
| Digium Asterisk | >=17.0.0<17.9.2 | |
| Digium Asterisk | >=18.0.0<18.2.1 | |
| Digium Certified Asterisk | =16.8 | |
| Digium Certified Asterisk | =16.8-cert1-rc1 | |
| Digium Certified Asterisk | =16.8-cert1-rc2 | |
| Digium Certified Asterisk | =16.8-cert1-rc3 | |
| Digium Certified Asterisk | =16.8-cert1-rc4 | |
| Digium Certified Asterisk | =16.8-cert2 | |
| Digium Certified Asterisk | =16.8-cert3 | |
| Digium Certified Asterisk | =16.8-cert4 | |
| Digium Certified Asterisk | =16.8-cert4-rc1 | |
| Digium Certified Asterisk | =16.8-cert4-rc2 | |
| Digium Certified Asterisk | =16.8-cert4-rc3 | |
| Digium Certified Asterisk | =16.8-cert4-rc4 | |
| Digium Certified Asterisk | =16.8-cert5 |
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Reference Links
Frequently Asked Questions
What is the vulnerability ID of this vulnerability?
The vulnerability ID of this vulnerability is CVE-2021-26713.
What is the severity of CVE-2021-26713?
The severity of CVE-2021-26713 is medium with a severity value of 6.5.
Which software versions are affected by CVE-2021-26713?
The affected software versions include Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, 18.x before 18.2.1, and Certified Asterisk before 16.8-cert6.
How can an authenticated WebRTC client exploit CVE-2021-26713?
An authenticated WebRTC client can exploit CVE-2021-26713 by sending multiple hold/unhold requests in quick succession, causing an Asterisk crash.
Is there a fix available for CVE-2021-26713?
Yes, the fix for CVE-2021-26713 is available. Please refer to the official references for more information.
- collector/nvd-index
- vendor/digium
- canonical/digium asterisk
- version/digium asterisk/16.0.0
- version/digium asterisk/17.0.0
- version/digium asterisk/18.0.0
- canonical/digium certified asterisk
- version/digium certified asterisk/16.8
- version/digium certified asterisk/16.8-cert1-rc1
- version/digium certified asterisk/16.8-cert1-rc2
- version/digium certified asterisk/16.8-cert1-rc3
- version/digium certified asterisk/16.8-cert1-rc4
- version/digium certified asterisk/16.8-cert2
- version/digium certified asterisk/16.8-cert3
- version/digium certified asterisk/16.8-cert4
- version/digium certified asterisk/16.8-cert4-rc1
- version/digium certified asterisk/16.8-cert4-rc2
- version/digium certified asterisk/16.8-cert4-rc3
- version/digium certified asterisk/16.8-cert4-rc4
- version/digium certified asterisk/16.8-cert5