CVE-2021-26712
HIGH
7.5
CVSS Score
Published: February 18, 2021 at 08:10 PM UTC
Updated: June 17, 2026 at 03:43 AM UTC
2 products affected across 1 vendorAsteriskCertified Asterisk
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Severity
HIGH7.5
Exploit prediction
EPSS 4%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
13.0.0 ≤ v ≤ 13.38.216.0.0 ≤ v < 16.16.117.0.0 ≤ v < 17.9.218.0 ≤ v < 18.2.1
Affected range stops below 16.16.1, so it looks safe — our inference, not a vendor statement
Affected range stops below 17.9.2, so it looks safe — our inference, not a vendor statement
Affected range stops below 18.2.1, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (5)
x_refsource_MISCThird Party Advisory
Source: [email protected]
http://packetstormsecurity.com/files/161473/Asterisk-Project-Security-Advisory-AST-2021-003.htmlMailing Listx_refsource_FULLDISCThird Party Advisory
Source: [email protected]
http://seclists.org/fulldisclosure/2021/Feb/59x_refsource_MISCVendor Advisory
Source: [email protected]
https://downloads.asterisk.org/pub/security/x_refsource_CONFIRMVendor Advisory
Source: [email protected]
https://downloads.asterisk.org/pub/security/AST-2021-003.htmlx_refsource_CONFIRMIssue TrackingPatchVendor Advisory
Source: [email protected]
https://issues.asterisk.org/jira/browse/ASTERISK-29260CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
NVD-CWE-Other
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