What’s Vulnerable › Vulnerabilities

CVE-2020-10593

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 2.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2020-03-23 · updated 2026-06-17
• Weakness: CWE-401

Description

Tor before 0.3.5.10, 0.4.x before 0.4.1.9, and 0.4.2.x before 0.4.2.7 allows remote attackers to cause a Denial of Service (memory leak), aka TROVE-2020-004. This occurs in circpad_setup_machine_on_circ because a circuit-padding machine can be negotiated twice on the same circuit.

Affected products

• openSUSE Backports Sle: 15.0-sp1
• openSUSE Leap: 15.1
• torproject Tor: from 0.3.5 before 0.3.5.10; from 0.4.1.0 (excl.) before 0.4.1.9; from 0.4.2.0 (excl.) through 0.4.2.7 — fixed in 0.3.5.10, 0.4.1.9

How to fix

Upgrade to a fixed version: torproject Tor 0.3.5.10, 0.4.1.9. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00045.html
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00052.html
• https://security.gentoo.org/glsa/202003-50
• https://trac.torproject.org/projects/tor/ticket/33619
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00045.html
• http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00052.html
• https://security.gentoo.org/glsa/202003-50
• https://trac.torproject.org/projects/tor/ticket/33619

Get alerted when CVE-2020-10593 or the next vulnerability affects your stack