CVE-2020-10592Network attack vector

Service interruption via remote CPU exhaustion

Published Mar 23, 2020 · Updated Aug 4, 2024

Denial of service in Tor before 0.3.5.10, before 0.4.1.9, and before 0.4.2.7 allows remote attackers to interrupt service via CPU exhaustion. The Tor Project has not published the malformed protocol input or processing routine that drives the excessive computation. Any remote user can repeatedly target a relay or authority, while a directory cache can target connected clients or onion services, causing disruptions lasting seconds or minutes and potentially creating traffic-analysis patterns.

CVSS severity7.5
High
EPSS probability3.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Tor before 0.3.5.10, before 0.4.1.9, and before 0.4.2.7 allows remote attackers to interrupt service via CPU exhaustion. The Tor Project has not published the malformed protocol input or processing routine that drives the excessive computation. Any remote user can repeatedly target a relay or authority, while a directory cache can target connected clients or onion services, causing disruptions lasting seconds or minutes and potentially creating traffic-analysis patterns.

The record

CVE
CVE-2020-10592
Published
Mar 23, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 23, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8NIST NVDAV:N/AC:L/Au:N/C:N/I:N/A:C
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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