main/http.c in the HTTP server in Asterisk Open Source 1.8.x before 1.8.20.2, 10.x before 10.12.2, and 11.x before 11.2.2; Certified Asterisk 1.8.15 before 1.8.15-cert2; and Asterisk Digiumphones 10.x-digiumphones before 10.12.2-digiumphones does not properly restrict Content-Length values, which allows remote attackers to conduct stack-consumption attacks and cause a denial of service (daemon crash) via a crafted HTTP POST request. NOTE: this vulnerability exists because of an incorrect fix for CVE-2012-5976.
Conclusion & alert: CVE-2013-2686 is rated Moderate Risk (47.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 2.13%). Mandatory action: Review affected assets and schedule remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-06-15 | 2.45% | 2.13% | -0.32% |
| 2 | 2025-03-30 | 4.60% | 2.45% | -2.15% |
| 3 | 2025-03-29 | — | 4.60% | — |
Full EPSS history (13 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
not yet assigned | CVE-2013-2686 not yet assigned priority: Debian including 1 source packages (asterisk), 2 status rows across 2 suites (bullseye, sid): resolved 2. | https://security-tracker.debian.org/tracker/CVE-2013-2686 |
gentoo
|
high | CVE-2013-2686: 1 GLSA(s) (201401-15), 1 atom(s) (net-misc/asterisk); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-2686 |
ubuntu
|
medium | CVE-2013-2686 medium priority: Ubuntu including 1 source packages (asterisk), 15 status rows across 15 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, trusty, upstream, utopic, vivid, wily, xenial, yakkety, zesty): ignored 7, not-affected 6, DNE 1, released 1. | https://ubuntu.com/security/CVE-2013-2686 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:beta1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:beta2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:beta3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:beta4:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:beta5:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:rc4:*:*:*:*:*:* |
| asterisk | open_source | 1.8.0 | cpe:2.3:a:asterisk:open_source:1.8.0:rc5:*:*:*:*:*:* |
| asterisk | open_source | 1.8.1 | cpe:2.3:a:asterisk:open_source:1.8.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.1 | cpe:2.3:a:asterisk:open_source:1.8.1:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.1.1 | cpe:2.3:a:asterisk:open_source:1.8.1.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.1.2 | cpe:2.3:a:asterisk:open_source:1.8.1.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.2 | cpe:2.3:a:asterisk:open_source:1.8.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.2 | cpe:2.3:a:asterisk:open_source:1.8.2:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.2.1 | cpe:2.3:a:asterisk:open_source:1.8.2.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.2.2 | cpe:2.3:a:asterisk:open_source:1.8.2.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.2.3 | cpe:2.3:a:asterisk:open_source:1.8.2.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.2.4 | cpe:2.3:a:asterisk:open_source:1.8.2.4:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3 | cpe:2.3:a:asterisk:open_source:1.8.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3 | cpe:2.3:a:asterisk:open_source:1.8.3:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3 | cpe:2.3:a:asterisk:open_source:1.8.3:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3 | cpe:2.3:a:asterisk:open_source:1.8.3:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3.1 | cpe:2.3:a:asterisk:open_source:1.8.3.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3.2 | cpe:2.3:a:asterisk:open_source:1.8.3.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.3.3 | cpe:2.3:a:asterisk:open_source:1.8.3.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4 | cpe:2.3:a:asterisk:open_source:1.8.4:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4 | cpe:2.3:a:asterisk:open_source:1.8.4:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4 | cpe:2.3:a:asterisk:open_source:1.8.4:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4 | cpe:2.3:a:asterisk:open_source:1.8.4:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4.1 | cpe:2.3:a:asterisk:open_source:1.8.4.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4.2 | cpe:2.3:a:asterisk:open_source:1.8.4.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4.3 | cpe:2.3:a:asterisk:open_source:1.8.4.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.4.4 | cpe:2.3:a:asterisk:open_source:1.8.4.4:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.5 | cpe:2.3:a:asterisk:open_source:1.8.5:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.5.0 | cpe:2.3:a:asterisk:open_source:1.8.5.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.6.0 | cpe:2.3:a:asterisk:open_source:1.8.6.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.6.0 | cpe:2.3:a:asterisk:open_source:1.8.6.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.6.0 | cpe:2.3:a:asterisk:open_source:1.8.6.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.6.0 | cpe:2.3:a:asterisk:open_source:1.8.6.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.7.0 | cpe:2.3:a:asterisk:open_source:1.8.7.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.7.0 | cpe:2.3:a:asterisk:open_source:1.8.7.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.7.0 | cpe:2.3:a:asterisk:open_source:1.8.7.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.7.1 | cpe:2.3:a:asterisk:open_source:1.8.7.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.7.2 | cpe:2.3:a:asterisk:open_source:1.8.7.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.0 | cpe:2.3:a:asterisk:open_source:1.8.8.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.0 | cpe:2.3:a:asterisk:open_source:1.8.8.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.0 | cpe:2.3:a:asterisk:open_source:1.8.8.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.0 | cpe:2.3:a:asterisk:open_source:1.8.8.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.0 | cpe:2.3:a:asterisk:open_source:1.8.8.0:rc4:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.0 | cpe:2.3:a:asterisk:open_source:1.8.8.0:rc5:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.1 | cpe:2.3:a:asterisk:open_source:1.8.8.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.8.2 | cpe:2.3:a:asterisk:open_source:1.8.8.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.0 | cpe:2.3:a:asterisk:open_source:1.8.9.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.0 | cpe:2.3:a:asterisk:open_source:1.8.9.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.0 | cpe:2.3:a:asterisk:open_source:1.8.9.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.0 | cpe:2.3:a:asterisk:open_source:1.8.9.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.1 | cpe:2.3:a:asterisk:open_source:1.8.9.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.2 | cpe:2.3:a:asterisk:open_source:1.8.9.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.9.3 | cpe:2.3:a:asterisk:open_source:1.8.9.3:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.10.0 | cpe:2.3:a:asterisk:open_source:1.8.10.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.10.0 | cpe:2.3:a:asterisk:open_source:1.8.10.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.10.0 | cpe:2.3:a:asterisk:open_source:1.8.10.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.10.0 | cpe:2.3:a:asterisk:open_source:1.8.10.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.10.0 | cpe:2.3:a:asterisk:open_source:1.8.10.0:rc4:*:*:*:*:*:* |
| asterisk | open_source | 1.8.10.1 | cpe:2.3:a:asterisk:open_source:1.8.10.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.11.0 | cpe:2.3:a:asterisk:open_source:1.8.11.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.11.0 | cpe:2.3:a:asterisk:open_source:1.8.11.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.11.0 | cpe:2.3:a:asterisk:open_source:1.8.11.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.11.1 | cpe:2.3:a:asterisk:open_source:1.8.11.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.12 | cpe:2.3:a:asterisk:open_source:1.8.12:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.12.0 | cpe:2.3:a:asterisk:open_source:1.8.12.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.12.0 | cpe:2.3:a:asterisk:open_source:1.8.12.0:rc2:*:*:*:*:*:* |
| asterisk | open_source | 1.8.12.0 | cpe:2.3:a:asterisk:open_source:1.8.12.0:rc3:*:*:*:*:*:* |
| asterisk | open_source | 1.8.12.1 | cpe:2.3:a:asterisk:open_source:1.8.12.1:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.12.2 | cpe:2.3:a:asterisk:open_source:1.8.12.2:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.13.0 | cpe:2.3:a:asterisk:open_source:1.8.13.0:*:*:*:*:*:*:* |
| asterisk | open_source | 1.8.13.0 | cpe:2.3:a:asterisk:open_source:1.8.13.0:rc1:*:*:*:*:*:* |
| asterisk | open_source | 1.8.13.0 | cpe:2.3:a:asterisk:open_source:1.8.13.0:rc2:*:*:*:*:*:* |