CVE-2021-21317
In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups.
Does this matter?
Lower severity and a low EPSS score (2.52%). Track it; it rarely justifies an emergency change on its own.
Description
uap-core in an open-source npm package which contains the core of BrowserScope's original user agent string parser. In uap-core before version 0.11.0, some regexes are vulnerable to regular expression denial of service (REDoS) due to overlapping capture groups. This allows remote attackers to overload a server by setting the User-Agent header in an HTTP(S) request to maliciously crafted long strings. This is fixed in version 0.11.0. Downstream packages such as uap-python, uap-ruby etc which depend upon uap-core follow different version schemes.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- EPSS
- 2.52% probability · 84th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-400, CWE-1333
- Affected
- uap-core project/uap-core
- Source
- security-advisories@github.com
References
- https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96cPatch
- https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4Third Party Advisory
- https://www.npmjs.com/package/uap-coreProduct, Third Party Advisory
- https://github.com/ua-parser/uap-core/commit/dc9925d458214cfe87b93e35346980612f6ae96cPatch
- https://github.com/ua-parser/uap-core/security/advisories/GHSA-p4pj-mg4r-x6v4Third Party Advisory
- https://www.npmjs.com/package/uap-coreProduct, Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.