CVSS 3.0
5.3 mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LCVE-2018-20164
Medium (5.3) in uaparser user agent parser-core. EPSS 3.3% chance of exploitation in the next 30 days. Fixed in uap-core 0.6.0.
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.)
Severity
- EPSS
- 3.3% chance of exploitation in the next 30 days; higher than 88% of CVEs (scores of 2026-10-31)
- CWE
- CWE-185
- Published
- Modified
- Record from
- the NVD, synced
Affected
- uaparser:user_agent_parser-core
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-fx7m-j728-mjw3 | npm | uap-core | <0.6.0 | 0.6.0 |
References
- https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014
- https://github.com/ua-parser/uap-core/commit/156f7e12b215bddbaf3df4514c399d683e6cdadc
- https://github.com/ua-parser/uap-core/issues/332
- https://www.x41-dsec.de/lab/advisories/x41-2018-009-uaparser/
- https://github.com/ua-parser/uap-core/commit/010ccdc7303546cd22b9da687c29f4a996990014