CVE-2020-10593

What it is

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.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

2.3% chance of exploitation in the next 30 days (EPSS).

Fix

No patch or advisory is linked yet. Look at mitigations or restrict exposure.

Timeline

1. 2020-03-23 13:15 UTC PublishedDisclosed publicly on CVE.org and NVD
2. 2026-06-17 02:48 UTC Last updatedMost recent change to the record

Why it ranks here

• Exploited in the wild: no, CISA does not list it.
• Exploit odds: 2.3% in the next 30 days (EPSS).
• Severity: 7.5 HIGH (CVSS).
• Fix: none linked yet, which raises it.

Details

Published

2020-03-23 13:15 UTC

Last modified

2026-06-17 02:48 UTC

Exploit probability

2.3% · EPSS, next 30 days

Weakness

CWE-401

Record status

Modified

Affected

• Torproject Tor < 0.3.5.10
• Torproject Tor < 0.4.1.9
• Torproject Tor ≤ 0.4.2.7
• Opensuse Backports Sle 15.0
• Opensuse Leap 15.1

Attack profile CVSS 3.1 · 7.5

Attack vector

Network

Complexity

Low

Privileges needed

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Is it in your code?

Hand this to your coding agent. It searches your project for the affected products and checks versions. Nothing leaves your machine.

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