CVE-2019-8955
UnknownEPSS 4.57%
Last modified
CVE-2019-8955 is a vulnerability of currently unknown severity. In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.. EPSS estimates a 4.57% chance of exploitation in the next 30 days.
Description
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Torproject | Tor | < 0.3.3.12 | — |
| Torproject | Tor | >= 0.3.4.8, < 0.3.4.11 | — |
| Torproject | Tor | 0.3.4.0 | Alpha-Dev |
| Torproject | Tor | 0.3.4.1 | Alpha |
| Torproject | Tor | 0.3.4.2 | Alpha |
| Torproject | Tor | 0.3.4.3 | Alpha |
| Torproject | Tor | 0.3.4.4 | Rc |
| Torproject | Tor | 0.3.4.5 | Rc |
| Torproject | Tor | 0.3.4.6 | Rc |
| Torproject | Tor | 0.3.4.7 | Rc |
| Torproject | Tor | 0.3.5.0 | Alpha-Dev |
| Torproject | Tor | 0.3.5.1 | Alpha |
| Torproject | Tor | 0.3.5.2 | Alpha |
| Torproject | Tor | 0.3.5.3 | Alpha |
| Torproject | Tor | 0.3.5.4 | Alpha |
| Torproject | Tor | 0.3.5.5 | Alpha |
| Torproject | Tor | 0.3.5.6 | Rc |
| Torproject | Tor | 0.3.5.7 | — |
| Torproject | Tor | 0.4.0.1 | Alpha |
References
- http://www.securityfocus.com/bid/107136Third Party Advisory, VDB Entry
- https://trac.torproject.org/projects/tor/ticket/29168Vendor Advisory
- http://www.securityfocus.com/bid/107136Third Party Advisory, VDB Entry
- https://trac.torproject.org/projects/tor/ticket/29168Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-8955?
In Tor before 0.3.3.12, 0.3.4.x before 0.3.4.11, 0.3.5.x before 0.3.5.8, and 0.4.x before 0.4.0.2-alpha, remote denial of service against Tor clients and relays can occur via memory exhaustion in the KIST cell scheduler.
How severe is CVE-2019-8955?
Severity scoring for CVE-2019-8955 is pending analysis. The EPSS model estimates a 4.57% probability of exploitation in the next 30 days.
How do I fix CVE-2019-8955?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
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Are you affected by CVE-2019-8955?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST