No exploitation reportedFix available

CVE-2018-17281

No exploitation reported by the sources we read.

Published2018-09-24
WeaknessCWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

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.

Timeline

dates in UTC

2018-09-2422:29CVE publishedNVD
2026-10-2319:23EPSS crossed 10 %FIRST EPSS

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2018-17281?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2018-17281?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Digium certified asterisk

Branch	Affected	Fixed in	Source
11.6	= 11.6	no fix published	NVD
13.1	= 13.1	no fix published	NVD
13.8	= 13.8	no fix published	NVD
13.13	= 13.13	no fix published	NVD
13.21	= 13.21	no fix published	NVD

Digium asterisk

Branch	Affected	Fixed in	Source
13.x	≥ 13.0.0, ≤ 13.23.0	no fix published	NVD
14.x	≥ 14.0.0, ≤ 14.7.7	no fix published	NVD
15.x	≥ 15.0.0, ≤ 15.6.0	no fix published	NVD

Debian debian linux

Branch	Affected	Fixed in	Source
8.0	= 8.0	no fix published	NVD
9.0	= 9.0	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Fix

Advisories and patches

downloads.asterisk.orgPatch · Vendor Advisory
seclists.orgPatch
seclists.orgPatch

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.07.5read 2026-10-23
NVDCVSS 2.05read 2026-10-23
NVDweakness (CWE)CWE-400read 2026-10-23
FIRST EPSSEPSS score52.4 %read 2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published: 2018-09-24
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2018-17281?

Is CVE-2018-17281 actively exploited?

Active exploitation of CVE-2018-17281 has not been confirmed. Its EPSS score was 52.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-17281?

CVE-2018-17281 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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