CVE-2024-35313Network attack vector

Guard discovery via undersized onion-service circuits

Published May 17, 2024 · Updated Mar 27, 2025

Information disclosure in Tor Arti 1.2.2 allows remote attackers to identify L2 and L3 guards through undersized onion-service circuits. With full vanguards enabled, tor-circmgr 0.18.0 omits a required extra hop in some circuit-construction paths, producing three-hop circuits instead of the intended longer paths. Only clients or services using full vanguards for onion-service connections are affected; the defect weakens resistance to traffic analysis without granting direct data access or modification.

CVSS severity5.9
Medium
EPSS probability0.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Information disclosure in Tor Arti 1.2.2 allows remote attackers to identify L2 and L3 guards through undersized onion-service circuits. With full vanguards enabled, tor-circmgr 0.18.0 omits a required extra hop in some circuit-construction paths, producing three-hop circuits instead of the intended longer paths. Only clients or services using full vanguards for onion-service connections are affected; the defect weakens resistance to traffic analysis without granting direct data access or modification.

The record

CVE
CVE-2024-35313
Published
May 17, 2024
Updated
Mar 27, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-130, CWE-754, T1040
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Mar 27, 2025Record 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

5.9GitHub Advisory DatabaseCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
7.3CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L

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

CWE-130Improper Handling of Length Parameter Inconsistency
CWE-754Improper Check for Unusual or Exceptional Conditions
T1040Network Sniffing

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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