CVE-2018-20164

MediumCVSS 5.3/10Last modified Jun 17, 2026

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.)

Metrics

CVSS 3.0 5.3/10CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness enumeration

CWE-185

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014Patch, Third Party Advisory
https://github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadcPatch, Third Party Advisory
https://github.com/ua-parser/uap-core/issues/332
https://www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser/Exploit, Third Party Advisory
https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014Patch, Third Party Advisory
https://github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadcPatch, Third Party Advisory
https://github.com/ua-parser/uap-core/issues/332
https://www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser/Exploit, Third Party Advisory

Timeline

Published: Feb 13, 2019
Last modified: Jun 17, 2026
NVD status: Modified

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