CVE catalog
CVE-2021-26713
ALPINE-CVE-2021-26713
- Severity
- Medium · CVSS 6.5
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H - Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 1.87% · Oct 27, 2026
A stack-based buffer overflow in res_rtp_asterisk.c in Sangoma Asterisk before 16.16.1, 17.x before 17.9.2, and 18.x before 18.2.1 and Certified Asterisk before 16.8-cert6 allows an authenticated WebRTC client to cause an Asterisk crash by sending multiple hold/unhold requests in quick succession. This is caused by a signedness comparison mismatch.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Alpine | asterisk | 3.12 | 16.16.1-r0 | fixed |
| Alpine | asterisk | 3.13 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.14 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.15 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.16 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.17 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.18 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.19 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.20 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.21 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.22 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.23 | 18.2.1-r0 | fixed |
| Alpine | asterisk | 3.24 | 18.2.1-r0 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Alpine | asterisk | apk | 3.12 | 16.16.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.13 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.14 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.15 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.16 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.17 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.18 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.19 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.20 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.21 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.22 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.23 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
| Alpine | asterisk | apk | 3.24 | 18.2.1-r0 | Not reported | ALPINE-CVE-2021-26713 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: