CVE-2021-28089

moderate-risk
Published 2021-03-19

Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust CPU resources on a target, aka TROVE-2021-001.

Do I need to act?

~
1.2% chance of exploitation in next 30 days
EPSS score — moderate 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 (6)

Tor
Tor
Tor
Tor
Tor

Affected Vendors

Fedoraproject Torproject

References (8)

Release Notes https://blog.torproject.org/node/2009
Vendor Advisory https://gitlab.torproject.org/tpo/core/tor/-/issues/40304
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://security.gentoo.org/glsa/202107-25
Release Notes https://blog.torproject.org/node/2009
Vendor Advisory https://gitlab.torproject.org/tpo/core/tor/-/issues/40304
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedorapro...
Third Party Advisory https://security.gentoo.org/glsa/202107-25
43
/ 100
moderate-risk
Severity 26/34 · High
Exploitability 4/34 · Minimal
Exposure 13/34 · Low