Security readout for executives and security teams
Plain-English summary
This is an old Tor denial-of-service issue. A remote attacker could trigger an assertion failure that exits the Tor daemon, interrupting service availability. The supplied sources do not provide CVSS scoring or evidence of active exploitation.
Executive priority
Treat this as a targeted availability risk for legacy Tor deployments. It is not KEV-listed in the supplied data, but affected internet-facing services should be updated or retired.
Technical view
Tor versions before 0.2.3.23-rc are described as vulnerable to daemon exit when a renegotiation attempt occurs after V3 link protocol initiation. The impact stated in the source bundle is denial of service, not code execution or data compromise.
Likely exposure
Exposure is limited to environments still running Tor before 0.2.3.23-rc. Internet-reachable Tor daemons are the most relevant assets to review because the issue is remotely triggerable.
Exploitation context
The source bundle marks KEV as false and provides no cited evidence of active exploitation. The documented attack outcome is service disruption through Tor daemon termination.
Researcher notes
Evidence is sparse: no CVSS, CWE, CPE, or detailed affected-product metadata is included. Analysis relies on the CVE description and Tor changelog reference only.
Mitigation direction
- Identify any Tor installations older than 0.2.3.23-rc.
- Upgrade Tor to 0.2.3.23-rc or a later vendor-supported release.
- Review Tor Project guidance and changelog for any deployment-specific notes.
- Ensure service monitoring restarts failed Tor daemons where appropriate.
Validation and detection
- Inventory Tor versions across servers, relays, bridges, and packaged images.
- Confirm no production system runs Tor before 0.2.3.23-rc.
- Check logs for unexpected Tor assertion failures or daemon exits.
- Verify monitoring alerts on Tor process termination and service unavailability.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2012-2249 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://gitweb.torproject.org/tor.git?a=blob_plain%3Bhb=HEAD%3Bf=ChangeLogCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.