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Medium severity6.5NVD Advisory· Published Aug 30, 2022· Updated Jun 17, 2026

CVE-2021-46837

CVE-2021-46837

Description

res_pjsip_t38 in Sangoma Asterisk 16.x before 16.16.2, 17.x before 17.9.3, and 18.x before 18.2.2, and Certified Asterisk before 16.8-cert7, allows an attacker to trigger a crash by sending an m=image line and zero port in a response to a T.38 re-invite initiated by Asterisk. This is a re-occurrence of the CVE-2019-15297 symptoms but not for exactly the same reason. The crash occurs because there is an append operation relative to the active topology, but this should instead be a replace operation.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

14
  • Asterisk/Certified Asterisk7 versions
    cpe:2.3:a:asterisk:certified_asterisk:16.8.0:-:*:*:*:*:*:*+ 6 more
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:-:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert1:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert2:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert3:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert4:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert5:*:*:*:*:*:*
    • cpe:2.3:a:asterisk:certified_asterisk:16.8.0:cert6:*:*:*:*:*:*
  • Digium/Asterisk
    cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
    Range: >=16.0.0,<16.16.2
  • Debian/linux3 versions
    cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:o:debian:debian_linux:10.0:*:*:*:*:*:*:*
    • cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*
    • cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*
  • Freepbx/Asteriskcpe-rescue2 versions
    (expand)+ 1 more
    • (no CPE)
    • (no CPE)range: <16.16.2, <17.9.3, <18.2.2
  • Freepbx/Certified Asteriskllm-create
    Range: <16.8-cert7

Patches

Vulnerability mechanics

References

3

News mentions

0

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