CVE-2018-17281

There is a stack consumption vulnerability in the res_http_websocket.so module of Asterisk through 13.23.0, 14.7.x through 14.7.7, and 15.x through 15.6.0 and Certified Asterisk through 13.21-cert2. It allows an attacker to crash Asterisk via a specially crafted HTTP request to upgrade the connection to a websocket.

Published: 2018-09-24 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-17281 is rated Moderate Risk (64.3/100): CVSS High severity, with high exploitation likelihood (EPSS 80.26%, 99th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-17281

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 2025-12-22 80.65% 80.26% -0.39%
2 2025-11-21 84.06% 80.65% -3.42%
3 2025-11-18 — 84.06% —

Full EPSS history (18 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-17281

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-17281

OS Trackers for CVE-2018-17281

vendor priority summary link
debian not yet assigned CVE-2018-17281 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-2018-17281
gentoo normal CVE-2018-17281: 1 GLSA(s) (201811-11), 1 atom(s) (net-misc/asterisk); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-17281
ubuntu medium CVE-2018-17281 medium priority: Ubuntu including 1 source packages (asterisk), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): not-affected 14, needed 2, DNE 1, ignored 1, released 1. https://ubuntu.com/security/CVE-2018-17281

Affected software / configurations for CVE-2018-17281

Vendor Product Version Raw CPE
digium asterisk >= 13.0.0, <= 13.23.0 cpe:2.3:a:digium:asterisk:*:*:*:*:lts:*:*:*
digium asterisk >= 14.0.0, <= 14.7.7 cpe:2.3:a:digium:asterisk:*:*:*:*:*:*:*:*
digium asterisk >= 15.0.0, <= 15.6.0 cpe:2.3:a:digium:asterisk:*:*:*:*:standard:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert12:*:*:lts:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert13:*:*:lts:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert14:*:*:lts:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert15:*:*:lts:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert16:*:*:lts:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert17:*:*:lts:*:*:*
digium certified_asterisk 11.6 cpe:2.3:a:digium:certified_asterisk:11.6:cert18:*:*:lts:*:*:*
digium certified_asterisk 13.1 cpe:2.3:a:digium:certified_asterisk:13.1:cert3:*:*:lts:*:*:*
digium certified_asterisk 13.1 cpe:2.3:a:digium:certified_asterisk:13.1:cert4:*:*:lts:*:*:*
digium certified_asterisk 13.1 cpe:2.3:a:digium:certified_asterisk:13.1:cert5:*:*:lts:*:*:*
digium certified_asterisk 13.1 cpe:2.3:a:digium:certified_asterisk:13.1:cert6:*:*:lts:*:*:*
digium certified_asterisk 13.1 cpe:2.3:a:digium:certified_asterisk:13.1:cert7:*:*:lts:*:*:*
digium certified_asterisk 13.1 cpe:2.3:a:digium:certified_asterisk:13.1:cert8:*:*:lts:*:*:*
digium certified_asterisk 13.8 cpe:2.3:a:digium:certified_asterisk:13.8:cert1:*:*:lts:*:*:*
digium certified_asterisk 13.8 cpe:2.3:a:digium:certified_asterisk:13.8:cert2:*:*:lts:*:*:*
digium certified_asterisk 13.8 cpe:2.3:a:digium:certified_asterisk:13.8:cert3:*:*:lts:*:*:*
digium certified_asterisk 13.8 cpe:2.3:a:digium:certified_asterisk:13.8:cert4:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert1:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert2:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert3:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert4:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert5:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert6:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert7:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert8:*:*:lts:*:*:*
digium certified_asterisk 13.13 cpe:2.3:a:digium:certified_asterisk:13.13:cert9:*:*:lts:*:*:*
digium certified_asterisk 13.21 cpe:2.3:a:digium:certified_asterisk:13.21:cert1:*:*:lts:*:*:*
digium certified_asterisk 13.21 cpe:2.3:a:digium:certified_asterisk:13.21:cert2:*:*:lts:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2018-17281

URL Tags
http://downloads.asterisk.org/pub/security/AST-2018-009.html Patch Vendor Advisory
http://packetstormsecurity.com/files/149453/Asterisk-Project-Security-Advisory-AST-2018-009.html Third Party Advisory VDB Entry
http://seclists.org/fulldisclosure/2018/Sep/31 Mailing List Patch Third Party Advisory
http://www.securityfocus.com/bid/105389 Third Party Advisory VDB Entry
http://www.securitytracker.com/id/1041694 Third Party Advisory VDB Entry
https://issues.asterisk.org/jira/browse/ASTERISK-28013 Issue Tracking Third Party Advisory
https://lists.debian.org/debian-lts-announce/2018/09/msg00034.html Mailing List Third Party Advisory
https://seclists.org/bugtraq/2018/Sep/53 Mailing List Patch Third Party Advisory
https://security.gentoo.org/glsa/201811-11 Third Party Advisory
https://www.debian.org/security/2018/dsa-4320 Third Party Advisory
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