CVE-2021-28089
HIGH
7.5
CVSS Score
Published: March 19, 2021 at 04:18 AM UTC
Updated: June 17, 2026 at 03:45 AM UTC
2 products affected across 2 vendorsFedoraTor
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Severity
HIGH7.5
Exploit prediction
EPSS 2%
Description
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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
95%
v < 0.3.5.140.4.4.4 ≤ v < 0.4.4.80.4.5.0 ≤ v < 0.4.5.70.4.4.0 alpha0.4.4.1 alpha0.4.4.2 alpha0.4.4.3 alpha
Affected range stops below 0.3.5.14, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.4.4.8, so it looks safe — our inference, not a vendor statement
Affected range stops below 0.4.5.7, so it looks safe — our inference, not a vendor statement
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
References (4)
x_refsource_CONFIRMRelease NotesVendor Advisory
Source: [email protected]
https://blog.torproject.org/node/2009x_refsource_MISCVendor Advisory
Source: [email protected]
https://gitlab.torproject.org/tpo/core/tor/-/issues/40304Vendor Advisoryx_refsource_FEDORA
Source: [email protected]
https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/HPDXB2GZHG3VNOTWSXQ3QZVHNV76WCU5/Vendor Advisoryx_refsource_GENTOOThird Party Advisory
Source: [email protected]
https://security.gentoo.org/glsa/202107-25CVSS
- Attack Vector
- NETWORK
- Complexity
- LOW
- Privileges
- NONE
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
Vector?
Quick Info
StatusMODIFIED
CWE
CWE-400
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