CVE-2018-20164 uap-core Regular Expression Denial of Service issue

MediumCVSS 5.3 EPSS 3.3%

Published: 2019-02-13 16:00
Updated: 2026-10-23 21:03
Exploit status: No public exploit known

Description

An issue was discovered in regex.yaml (aka regexes.yaml) in UA-Parser UAP-Core before 0.6.0. A Regular Expression Denial of Service (ReDoS) issue allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to a value containing a long digit string. (The UAP-Core project contains the vulnerability, propagating to all implementations.)

Affected products

Product	Affected versions	Fixed in
npm uap-core(npm)	< 0.6.0	0.6.0
debian/uap-core(Debian:12)	< 20190213-1	20190213-1
debian/uap-core(Debian:14)	< 20190213-1	20190213-1
debian/uap-core(Debian:13)	< 20190213-1	20190213-1
uaparser user agent parser-core	< 0.6.0	0.6.0

References

nvd.nist.gov third-party-advisory
github.com
github.com patch third-party-advisory
github.com patch third-party-advisory
www.x41-dsec.de exploit third-party-advisory
github.com
Debian Security Tracker CVE-2018-20164 vendor-advisory
bugs.debian.org issue-tracking

CVSS v3.0

5.3 Medium

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Unchanged
Confidentiality: None
Integrity: None
Availability: Low

All scores (4)

v3.0 5.3 · nvd@nist.gov
v3.0 5.3 · osv:debian
v3.0 5.3 · github
v2.0 5.0 · nvd@nist.gov

Weakness & likelihood

EPSS (exploitation probability, 30 days): 3.30% (percentile 88.7)
CWE: CWE-185 Incorrect Regular Expression

Public exploit references

Metadata only. CVERadar never hosts or runs exploit code.

No public exploit references known.