CVE-2018-20164
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.
Does this matter?
Lower severity and a low EPSS score (3.30%). Track it; it rarely justifies an emergency change on its own.
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.)
- CVSS 3.0
- 5.3 MEDIUMCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 3.30% probability · 88th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-185
- Affected
- uaparser/user agent parser-core
- Source
- cve@mitre.org
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
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.