CVE-2020-10593

Name: CVE-2020-10593
Creator: NVD / NIST
Published: 2020-03-23T13:15:13.033+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.28%

Last modified Jun 17, 2026

CVE-2020-10593 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. 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.. EPSS estimates a 2.28% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.28%

80.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-401

Affected Software

Vendor	Product	Versions	Update
Torproject	Tor	>= 0.3.5, < 0.3.5.10	—
Torproject	Tor	> 0.4.1.0, < 0.4.1.9	—
Torproject	Tor	> 0.4.2.0, <= 0.4.2.7	—
Opensuse	Backports Sle	15.0	Sp1
Opensuse	Leap	15.1	—

References

http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00045.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00052.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202003-50Third Party Advisory
https://trac.torproject.org/projects/tor/ticket/33619Issue Tracking, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00045.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-03/msg00052.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202003-50Third Party Advisory
https://trac.torproject.org/projects/tor/ticket/33619Issue Tracking, Third Party Advisory

Timeline

Published: Mar 23, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-10593?

How severe is CVE-2020-10593?

CVE-2020-10593 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.28% probability of exploitation in the next 30 days.

How do I fix CVE-2020-10593?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-10593?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST