CVE-2021-33503
moderate-risk
Published 2021-06-29
An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.
Do I need to act?
-
0.86% chance of exploitation
EPSS score — low exploit probability
-
Not on CISA KEV list
No confirmed active exploitation reported to CISA
?
Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
7
CVSS 7.5/10
High
NETWORK
/ LOW complexity
Affected Products (8)
Affected Vendors
References (12)
Third Party Advisory
https://github.com/advisories/GHSA-q2q7-5pp4-w6pg
Third Party Advisory
https://security.gentoo.org/glsa/202107-36
Third Party Advisory
https://github.com/advisories/GHSA-q2q7-5pp4-w6pg
Third Party Advisory
https://security.gentoo.org/glsa/202107-36
43
/ 100
moderate-risk
Severity
26/34 · High
Exploitability
3/34 · Minimal
Exposure
14/34 · Moderate