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TI-2021-09334 Aliases CVE-2021-28089GHSA-4457-rx56-p82r

Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust…

Priority LOW 36CWE-400Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-400.

Summary

Tor before 0.4.5.7 allows a remote participant in the Tor directory protocol to exhaust CPU resources on a target, aka TROVE-2021-001.

Why it matters now

EPSS 0.01672 76th percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 6

CPEVersionsRoleVendor
cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:*before 0.3.5.14; 0.4.4.4 to before 0.4.4.8; 0.4.5.0 to before 0.4.5.7Vulnerabletorproject
cpe:2.3:a:torproject:tor:0.4.4.0:alpha:*:*:*:*:*:*0.4.4.0 alphaVulnerabletorproject
cpe:2.3:a:torproject:tor:0.4.4.1:alpha:*:*:*:*:*:*0.4.4.1 alphaVulnerabletorproject
cpe:2.3:a:torproject:tor:0.4.4.2:alpha:*:*:*:*:*:*0.4.4.2 alphaVulnerabletorproject
cpe:2.3:a:torproject:tor:0.4.4.3:alpha:*:*:*:*:*:*0.4.4.3 alphaVulnerabletorproject
cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:*33VulnerableFedoraproject
  • cpe:2.3:a:torproject:tor:*:*:*:*:*:*:*:* Versions before 0.3.5.14; 0.4.4.4 to before 0.4.4.8; 0.4.5.0 to before 0.4.5.7 Vulnerable ·torproject
  • cpe:2.3:a:torproject:tor:0.4.4.0:alpha:*:*:*:*:*:* Versions 0.4.4.0 alpha Vulnerable ·torproject
  • cpe:2.3:a:torproject:tor:0.4.4.1:alpha:*:*:*:*:*:* Versions 0.4.4.1 alpha Vulnerable ·torproject
  • cpe:2.3:a:torproject:tor:0.4.4.2:alpha:*:*:*:*:*:* Versions 0.4.4.2 alpha Vulnerable ·torproject
  • cpe:2.3:a:torproject:tor:0.4.4.3:alpha:*:*:*:*:*:* Versions 0.4.4.3 alpha Vulnerable ·torproject
  • cpe:2.3:o:fedoraproject:fedora:33:*:*:*:*:*:*:* Versions 33 Vulnerable ·Fedoraproject

Remediation

No fixed version listed by the sources yet.

Vendor assessments

Red Hat

Red Hat's page for this CVE →

Not affected: 1 product
  • Red Hat

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-28089
  2. 2026-10-03 Alias added: GHSA-4457-rx56-p82r

References

Advisory 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences