CVE-2019-8955

high-risk

Published 2019-02-21

In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.

Do I need to act?

1.9% 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

CVSS 7.5/10 High

NETWORK / LOW complexity

Affected Products (18)

Tor

Affected Vendors

Torproject

References (8)

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00013.html

Third Party Advisory http://www.securityfocus.com/bid/107136

Vendor Advisory https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312

Vendor Advisory https://trac.torproject.org/projects/tor/ticket/29168

http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00013.html

Third Party Advisory http://www.securityfocus.com/bid/107136

Vendor Advisory https://blog.torproject.org/new-releases-tor-0402-alpha-0358-03411-and-03312

Vendor Advisory https://trac.torproject.org/projects/tor/ticket/29168

/ 100

high-risk

Severity 26/34 · High

Exploitability 5/34 · Minimal

Exposure 19/34 · Moderate