CVE-2021-32558
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before...
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- None
- Integrity
- None
- Availability
- High
Exploit likelihood
What each source reports
NVD Score used
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
CVE-2021-32558- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-74
- Updated
- 2026-11-02
CVE List No score
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
CVE-2021-32558- Updated
- 2026-11-02
EUVDEUVD-2021-19403 No score
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
EUVD-2021-19403- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-xhjf-mf8w-q63p No score
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before...
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
GHSA-xhjf-mf8w-q63p- Weakness
- CWE-74
- Updated
- 2026-11-02
OSVALPINE-CVE-2021-32558
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
ALPINE-CVE-2021-32558- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSV
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
CVE-2021-32558- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVDEBIAN-CVE-2021-32558
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
DEBIAN-CVE-2021-32558- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
OSVUBUNTU-CVE-2021-32558
An issue was discovered in Sangoma Asterisk 13.x before 13.38.3, 16.x before 16.19.1, 17.x before 17.9.4, and 18.x before 18.5.1, and Certified Asterisk before 16.8-cert10. If the IAX2 channel driver receives a packet that contains an unsupported media format, a crash can occur.
- Record
UBUNTU-CVE-2021-32558- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
asteriskAlpine:v3.11 |
13.0.0 up to 16.6.2-r1 | 16.6.2-r1 |
asteriskAlpine:v3.12 |
13.0.0 up to 16.16.1-r1 | 16.16.1-r1 |
asteriskAlpine:v3.13 |
13.0.0 up to 18.2.1-r2 | 18.2.1-r2 |
asteriskAlpine:v3.14 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.15 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.16 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.17 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.18 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.19 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.20 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
Show 15 moreShow less
| Package | Affected | Fixed |
|---|---|---|
asteriskAlpine:v3.21 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.22 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.23 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskAlpine:v3.24 |
13.0.0 up to 18.2.2-r2 | 18.2.2-r2 |
asteriskDebian:14 |
before 1:16.16.1~dfsg-2, plus listed versions 0.1.11-30.1.11-3woody11:1.0.5-21:1.0.5-41:1.0.6-1 Show 45 moreShow less1:1.0.6-21:1.0.7-11:1.0.7.dfsg.1-11:1.0.7.dfsg.1-21:1.0.7.dfsg.1-2sarge11:1.0.7.dfsg.1-2sarge21:1.0.7.dfsg.1-2sarge31:1.0.7.dfsg.1-2sarge41:1.0.7.dfsg.1-2sarge51:1.0.7.dfsg.1-2sarge61:1.0.9.dfsg-11:1.0.9.dfsg-31:1.0.9.dfsg-41:1.0.9.dfsg-51:1.0.9.dfsg-61:1.2.0-beta1.dfsg-11:1.2.0-beta2.dfsg-11:1.2.0-beta2.dfsg-21:1.2.0-beta2.dfsg-31:1.2.0-rc1.dfsg-11:1.2.0-rc2.dfsg-11:1.2.0.dfsg-11:1.2.0.dfsg-21:1.2.0.dfsg-31:1.2.0.dfsg-41:1.2.0.dfsg-51:1.2.0.dfsg-61:1.2.1.dfsg-11:1.2.1.dfsg-21:1.2.1.dfsg-31:1.2.10.dfsg-11:1.2.10.dfsg-1bpo11:1.2.10.dfsg-21:1.2.10.dfsg-31:1.2.11.dfsg-11:1.2.12.1.dfsg-11:1.2.13~dfsg-11:1.2.13~dfsg-21:1.2.13~dfsg-2etch11:1.2.13~dfsg-2etch21:1.2.13~dfsg-2etch31:1.2.13~dfsg-2etch41:1.2.14~dfsg-11:1.2.14~dfsg-21:1.2.14~dfsg-3 |
1:16.16.1~dfsg-2 |
asteriskDebian:9 |
before 1:13.14.1~dfsg-2+deb9u5, plus listed versions 1:13.14.1~dfsg-21:13.14.1~dfsg-2+deb9u11:13.14.1~dfsg-2+deb9u21:13.14.1~dfsg-2+deb9u31:13.14.1~dfsg-2+deb9u4 |
1:13.14.1~dfsg-2+deb9u5 |
asteriskDebian:11 |
before 1:16.16.1~dfsg-1+deb11u1, plus listed versions 1:16.16.1~dfsg-11:16.16.1~dfsg-1+deb11u1~bpo10+1 |
1:16.16.1~dfsg-1+deb11u1 |
asteriskUbuntu:Pro:16.04:LTS |
All versions, plus listed versions 1:13.1.0~dfsg-1.1ubuntu31:13.1.0~dfsg-1.1ubuntu41:13.1.0~dfsg-1.1ubuntu4.11:13.1.0~dfsg-1.1ubuntu4.1+esm1 |
None known |
asteriskUbuntu:18.04:LTS |
All versions, plus listed versions 1:13.17.2~dfsg-1ubuntu11:13.17.2~dfsg-2ubuntu11:13.18.1~dfsg-1ubuntu11:13.18.3~dfsg-1ubuntu11:13.18.3~dfsg-1ubuntu21:13.18.3~dfsg-1ubuntu31:13.18.3~dfsg-1ubuntu4 |
None known |
asteriskUbuntu:20.04:LTS |
All versions, plus listed versions 1:16.2.1~dfsg-2build21:16.2.1~dfsg-2build31:16.2.1~dfsg-2ubuntu1 |
None known |
asteriskUbuntu:22.04:LTS |
All versions, plus listed versions 1:16.16.1~dfsg-21:16.16.1~dfsg-41:16.16.1~dfsg-4build11:16.16.1~dfsg+~2.10-11:18.10.0~dfsg+~cs6.10.40431411-2 |
None known |
asteriskUbuntu:24.04:LTS |
All versions, plus listed versions 1:20.4.0~dfsg+~cs6.13.40431414-21:20.5.0~dfsg+~cs6.13.40431414-11:20.5.1~dfsg+~cs6.13.40431414-11:20.5.2~dfsg+~cs6.13.40431414-11:20.6.0~dfsg+~cs6.13.40431414-1 Show 4 moreShow less1:20.6.0~dfsg+~cs6.13.40431414-21:20.6.0~dfsg+~cs6.13.40431414-2build31:20.6.0~dfsg+~cs6.13.40431414-2build41:20.6.0~dfsg+~cs6.13.40431414-2build5 |
None known |
asteriskUbuntu:25.10 |
All versions, plus listed versions 1:22.2.0~dfsg+~cs6.15.60671435-21:22.3.0~dfsg+~cs6.15.60671435-11:22.4.1~dfsg+~cs6.15.60671435-11:22.4.1~dfsg+~cs6.15.60671435-21:22.5.1~dfsg+~cs6.15.60671435-11:22.5.2~dfsg+~cs6.15.60671435-1 |
None known |
asteriskUbuntu:26.10 |
All versions, plus listed versions 1:22.5.2~dfsg+~cs6.15.60671435-11:22.10.0+dfsg+~cs6.17.60671434-1ubuntu21:22.10.0+dfsg+~cs6.17.60671434-1ubuntu3 |
None known |
asteriskUbuntu:26.04:LTS |
All versions, plus listed versions 1:22.5.2~dfsg+~cs6.15.60671435-1 |
None known |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-32558 is a high vulnerability (CVSS 7.5) in Digium Asterisk, published July 27, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 9.22%, the 95th percentile. Fixed in asterisk 16.6.2-r1.
References
seclists.org/fulldisclosure/2021/Jul/49
packetstormsecurity.com/files/163639/Asterisk-Project-Security-Advisory-AST-2021-008.html
downloads.asterisk.org/pub/security/AST-2021-008.html
issues.asterisk.org/jira/browse/ASTERISK-29392
lists.debian.org/debian-lts-announce/2021/08/msg00005.html
debian.org/security/2021/dsa-4999
Left out here: 188 versions. The JSON record has them.