No exploitation reported

CVE-2017-17850

No exploitation reported by the sources we read.

Published2017-12-27
WeaknessCWE-20

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

An issue was discovered in Asterisk 13.18.4 and older, 14.7.4 and older, 15.1.4 and older, and 13.18-cert1 and older. A select set of SIP messages create a dialog in Asterisk. Those SIP messages must contain a contact header. For those messages, if the header was not present and the PJSIP channel driver was used, Asterisk would crash. The severity of this vulnerability is somewhat mitigated if authentication is enabled. If authentication is enabled, a user would have to first be authorized before reaching the crash point.

Timeline

dates in UTC

2017-12-2717:08CVE 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-2017-17850?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2017-17850?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Digium asterisk

Branch	Affected	Fixed in	Source
13.x	≥ 13.0.0, ≤ 13.18.4	no fix published	NVD
14.x	≥ 14.0.0, ≤ 14.7.4	no fix published	NVD
15.x	≥ 15.0.0, ≤ 15.1.4	no fix published	NVD

Digium certified asterisk

Branch	Affected	Fixed in	Source
13.1	= 13.1.0	no fix published	NVD
13.8	= 13.8	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.orgVendor Advisory
issues.asterisk.orgVendor Advisory

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-20read 2026-10-23
FIRST EPSSEPSS score75.4 %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: 2017-12-27
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2017-17850?

Is CVE-2017-17850 actively exploited?

Active exploitation of CVE-2017-17850 has not been confirmed. Its EPSS score was 75.4% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2017-17850?

CVE-2017-17850 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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