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CVE-2021-26712

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0...

7.5 HighFix available

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

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

3.63%Up 2.1 points since Apr 14, 2021
90%50%10%1%

What each source reports

NVD Score used 7.5

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
CVE-2021-26712
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0
5.0 MediumAV:N/AC:L/Au:N/C:N/I:N/A:P
Updated
2026-11-02
CVE List No score

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
CVE-2021-26712
Updated
2026-11-02
EUVDEUVD-2021-13501 No score

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
EUVD-2021-13501
Updated
2026-11-03
GitHub AdvisoriesGHSA-5ph6-fxv2-7rf2 No score

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0...

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
GHSA-5ph6-fxv2-7rf2
Updated
2026-11-02
OSVALPINE-CVE-2021-26712 7.5

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
ALPINE-CVE-2021-26712
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSV 7.5

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
CVE-2021-26712
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-26712 7.5

Incorrect access controls in res_srtp.c in Sangoma Asterisk 13.38.1, 16.16.0, 17.9.1, and 18.2.0 and Certified Asterisk 16.8-cert5 allow a remote unauthenticated attacker to prematurely terminate secure calls by replaying SRTP packets.

Record
UBUNTU-CVE-2021-26712
CVSS 3.1
7.5 HighCVSS: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

Affected packages
PackageAffectedFixed
asterisk
Alpine:v3.12
 13.0.0 up to 16.16.1-r0
16.16.1-r0
asterisk
Alpine:v3.13
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.14
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.15
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.16
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.17
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.18
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.19
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.20
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.21
 13.0.0 up to 18.2.1-r0
18.2.1-r0
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Affected packages
PackageAffectedFixed
asterisk
Alpine:v3.22
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.23
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Alpine:v3.24
 13.0.0 up to 18.2.1-r0
18.2.1-r0
asterisk
Ubuntu: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
asterisk
Ubuntu: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
asterisk
Ubuntu: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 less
1:20.6.0~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
asterisk
Ubuntu: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
asterisk
Ubuntu: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
asterisk
Ubuntu:26.04:LTS
 All versions, plus listed versions
1:22.5.2~dfsg+~cs6.15.60671435-1
 None known

History

History
RecordedChangedSources
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-26712 is a high vulnerability (CVSS 7.5) in Digium Asterisk, published February 18, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.63%, the 89th percentile. Fixed in asterisk 16.16.1-r0.

References

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