CVE-2021-21317 Denial of Service in uap-core

2021-02-1617:45:16

CWE-400

GitHub_M

www.cve.org

5.3 Medium

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

NONE

Integrity Impact

NONE

Availability Impact

LOW

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

0.003 Low

EPSS

Percentile

71.3%

JSON

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.

CNA Affected

[
  {
    "product": "uap-core",
    "vendor": "ua-parser",
    "versions": [
      {
        "status": "affected",
        "version": "< 0.11.0"
      }
    ]
  }
]