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
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 |
|---|---|---|
| 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