CVE-2020-15572
HIGHCVSS 7.5/10EPSS 1.40%
Last modified
CVE-2020-15572 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.. EPSS estimates a 1.40% chance of exploitation in the next 30 days.
Description
Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Torproject | Tor | < 0.3.5.11 | — |
| Torproject | Tor | > 0.4.2.0, < 0.4.2.8 | — |
| Torproject | Tor | > 0.4.3.0, < 0.4.3.6 | — |
| Torproject | Tor | 0.4.4.0 | Alpha |
| Torproject | Tor | 0.4.4.1 | Alpha |
References
- https://blog.torproject.org/new-release-tor-03511-0428-0436-security-fixesRelease Notes, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/issues/33119Vendor Advisory
- https://trac.torproject.org/projects/tor/wiki/TROVEVendor Advisory
- https://blog.torproject.org/new-release-tor-03511-0428-0436-security-fixesRelease Notes, Vendor Advisory
- https://gitlab.torproject.org/tpo/core/tor/-/issues/33119Vendor Advisory
- https://trac.torproject.org/projects/tor/wiki/TROVEVendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-15572?
Tor before 0.4.3.6 has an out-of-bounds memory access that allows a remote denial-of-service (crash) attack against Tor instances built to use Mozilla Network Security Services (NSS), aka TROVE-2020-001.
How severe is CVE-2020-15572?
CVE-2020-15572 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.40% probability of exploitation in the next 30 days.
How do I fix CVE-2020-15572?
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-2020-15572?
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