CVE-2020-27638
HIGHCVSS 7.5/10EPSS 2.33%
Last modified
CVE-2020-27638 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.. EPSS estimates a 2.33% chance of exploitation in the next 30 days.
Description
receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.
Metrics
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Fastd Project | Fastd | < 21.0 |
| Debian | Debian Linux | 9.0 |
| Fedoraproject | Fedora | 31 |
| Fedoraproject | Fedora | 32 |
| Fedoraproject | Fedora | 33 |
References
- https://bugs.debian.org/972521Issue Tracking, Third Party Advisory
- https://fastd.readthedocs.io/en/stable/releases/v21.htmlBroken Link, Release Notes, Third Party Advisory
- https://github.com/NeoRaider/fastd/commit/737925113363b6130879729cdff9ccc46c33eaeaPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00025.htmlMailing List, Third Party Advisory
- https://bugs.debian.org/972521Issue Tracking, Third Party Advisory
- https://fastd.readthedocs.io/en/stable/releases/v21.htmlBroken Link, Release Notes, Third Party Advisory
- https://github.com/NeoRaider/fastd/commit/737925113363b6130879729cdff9ccc46c33eaeaPatch, Third Party Advisory
- https://lists.debian.org/debian-lts-announce/2020/10/msg00025.htmlMailing List, Third Party Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2020-27638?
receive.c in fastd before v21 allows denial of service (assertion failure) when receiving packets with an invalid type code.
How severe is CVE-2020-27638?
CVE-2020-27638 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.33% probability of exploitation in the next 30 days.
How do I fix CVE-2020-27638?
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.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2020-27638?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST