CVEvulnerability

CVE-2020-5243

7.5 HIGH Published 2020-02-21 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2020-02-21
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
5.7 MEDIUM — CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H
CVSS 3.1 ([email protected])
7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0 ([email protected])
5.0 MEDIUM — AV:N/AC:L/Au:N/C:N/I:N/A:P
Weaknesses
CWE-1333, CWE-20

Description

uap-core before 0.7.3 is vulnerable to a denial of service attack when processing crafted User-Agent strings. 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 has been patched in uap-core 0.7.3.

Affected configurations

• uap-core project uap-core (< 0.7.3)

Related

Weakness · CWE (2)

  • CWE-1333 Inefficient Regular Expression Complexity weakness
  • CWE-20 Improper Input Validation weakness

Referenced by CWE · observed example (3)

  • CWE-1333 Inefficient Regular Expression Complexity weakness
  • CWE-405 Asymmetric Resource Consumption (Amplification) weakness
  • CWE-407 Inefficient Algorithmic Complexity weakness

References