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Date: Thu, 18 Feb 2021 11:37:16 -0600
From: "Asterisk Security Team" <>
Subject: [FD] AST-2021-003: Remote attacker could prematurely tear down SRTP

               Asterisk Project Security Advisory - AST-2021-003

         Product        Asterisk                                              
         Summary        Remote attacker could prematurely tear down SRTP      
    Nature of Advisory  Denial of Service                                     
      Susceptibility    Remote unauthenticated sessions                       
         Severity       Moderate                                              
      Exploits Known    No                                                    
       Reported On      January 22, 2021                                      
       Reported By      Alexander Traud                                       
        Posted On       
     Last Updated On    February 11, 2021                                     
     Advisory Contact   gjoseph AT sangoma DOT com                            
         CVE Name       CVE-2021-26712                                        

      Description     An unauthenticated remote attacker could replay SRTP    
                      packets which could cause an Asterisk instance          
                      configured without strict RTP validation to tear down   
                      calls prematurely.                                      
    Modules Affected  res_srtp.c res_rtp_asterisk.c                           

    Resolution  Asterisk now implements SRTP replay protection via a          
                ���srtpreplayprotection��� option in rtp.conf. The default is     

                               Affected Versions
                Product               Release Series  
          Asterisk Open Source             13.x       13.38.1                 
          Asterisk Open Source             16.x       16.16.0                 
          Asterisk Open Source             17.x       17.9.1                  
          Asterisk Open Source             18.x       18.2.0                  
           Certified Asterisk              16.x       16.8-cert5              

                                  Corrected In
               Product                              Release                   
        Asterisk Open Source           13.38.2, 16.16.1, 17.9.2, 18.2.1       
         Certified Asterisk                       16.8-cert6                  

                               Patch URL                              Revision  
   https:/   13.38.2    
   https:/   16.16.1    
   https:/   17.9.2     
   https:/   18.2.1     
   https:/ Certified  


    Asterisk Project Security Advisories are posted at                                                             
    This document may be superseded by later versions; if so, the latest      
    version will be posted at                                             and                      

                                Revision History
          Date                  Editor                 Revisions Made         
    February 4, 2021   George Joseph             Initial                      
    February 5, 2021   George Joseph             Added CVE ID                 

               Asterisk Project Security Advisory - AST-2021-003
               Copyright �� 2021 Digium, Inc. All Rights Reserved.
  Permission is hereby granted to distribute and publish this advisory in its
                           original, unaltered form.

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