What’s Vulnerable › Vulnerabilities
CVE-2020-35498
- Severity: high (CVSS 7.5 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 8.0% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2021-02-11 · updated 2026-06-17
- Weakness: CWE-400
Description
A vulnerability was found in openvswitch. A limitation in the implementation of userspace packet parsing can allow a malicious user to send a specially crafted packet causing the resulting megaflow in the kernel to be too wide, potentially causing a denial of service. The highest threat from this vulnerability is to system availability.
Affected products
- Debian Linux: 9.0, 10.0
- Fedoraproject Fedora: 33
- Openvswitch: from 2.5.0 before 2.5.12; from 2.6.0 before 2.6.10; from 2.7.0 before 2.7.13; from 2.8.0 before 2.8.11; from 2.9.0 before 2.9.9; from 2.10.0 before 2.10.7 — fixed in 2.10.7, 2.11.6, 2.12.3, 2.13.3, 2.14.2, 2.5.12
How to fix
Upgrade to a fixed version: Openvswitch 2.10.7, 2.11.6, 2.12.3, 2.13.3. Check the vendor advisory for mitigations.
References
- https://bugzilla.redhat.com/show_bug.cgi?id=1908845
- https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
- https://security.gentoo.org/glsa/202311-16
- https://www.debian.org/security/2021/dsa-4852
- https://www.openwall.com/lists/oss-security/2021/02/10/4
- https://bugzilla.redhat.com/show_bug.cgi?id=1908845
- https://lists.debian.org/debian-lts-announce/2021/02/msg00032.html
- https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/UJ4DXFJWMZ325ECZXPZOSK7BOEDJZHPR/
- https://security.gentoo.org/glsa/202311-16
- https://www.debian.org/security/2021/dsa-4852
- https://www.openwall.com/lists/oss-security/2021/02/10/4
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