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No exploitation reportedFix available

CVE-2018-20164

No exploitation reported by the sources we read.

  • Published2019-02-13
  • Fixed in0.6.0
  • WeaknessCWE-185

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 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.)

Timeline

dates in UTC
  1. 2019-02-1314:29CVE publishedNVD

Versions per branch

NVD · OSV
Uaparser user agent parser-core
BranchAffectedFixed in
0.6< 0.6.00.6.0

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • uap-coreDebian:14all versions · fixed in 20190213-1
  • uap-coreDebian:13all versions · fixed in 20190213-1
  • uap-coreDebian:12all versions · fixed in 20190213-1

Full record on NVD

Fix

  1. Update Uaparser user agent parser-core to 0.6.0

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.05.3read 2026-10-23
  • NVDCVSS 2.05read 2026-10-23
  • NVDweakness (CWE)CWE-185read 2026-10-23
  • FIRST EPSSEPSS score3.3 %2026-11-08
  • OSVaffected packages—
  • GitHub AdvisoriesadvisoryMODERATE2020-06-16

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published
2019-02-13
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-fx7m-j728-mjw3

Frequently asked questions

What is CVE-2018-20164?

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.)

Is CVE-2018-20164 actively exploited?

Active exploitation of CVE-2018-20164 has not been confirmed. Its EPSS score was 3.3% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2018-20164?

CVE-2018-20164 has a CVSS v3 base score of 5.3 (MEDIUM severity), with vector string CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L.

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