CVE-2021-21317
- Source
- https://cve.org/CVERecord?id=CVE-2021-21317
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2021-21317.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2021-21317
- Aliases
- Downstream
- Related
- Published
- 2021-02-16T18:15:12.583Z
- Modified
- 2026-04-12T01:01:13.200507Z
- Severity
-
- 5.3 (Medium) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L CVSS Calculator
- Summary
- [none]
- Details
-
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.
- References
Affected packages
Git / github.com/ua-parser/uap-core
Affected ranges
- Type
- GIT
- Repo
- https://github.com/ua-parser/uap-core
- Events
-
Introduced0 Unknown introduced commit / All previous commits are affectedFixedFixed
- Database specific
{ "source": [ "CPE_FIELD", "REFERENCES" ], "extracted_events": [ { "introduced": "0" }, { "fixed": "0.11.0" } ], "cpe": "cpe:2.3:a:uap-core_project:uap-core:*:*:*:*:*:node.js:*:*" }