HOMEVULNERABILITIESCVE-2020-35498
HIGH

CVE-2020-35498

CWE-400Published: February 11, 2021· Updated: Jun 17, 2026

7.5
CVSS v3.1

Official 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.

NVD Source

Technical Analysis

CVE-2020-35498 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 7.5.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected Vendors & Products

Debian1 product(s)
debian linux
Fedora1 product(s)
fedora
openvswitch1 product(s)
openvswitch
Source: NVD CPE · 4 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1908845
PATCHhttps://www.openwall.com/lists/oss-security/2021/02/10/4
PATCHhttps://bugzilla.redhat.com/show_bug.cgi?id=1908845
PATCHhttps://www.openwall.com/lists/oss-security/2021/02/10/4
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/02/msg00032.html
ADVISORYhttps://www.debian.org/security/2021/dsa-4852
ADVISORYhttps://lists.debian.org/debian-lts-announce/2021/02/msg00032.html
ADVISORYhttps://www.debian.org/security/2021/dsa-4852

All References (12)

→
https://bugzilla.redhat.com/show_bug.cgi?id=1908845Issue Tracking · Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing List · Third Party Advisory
→
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-4852Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/02/10/4Mailing List · Patch · Third Party Advisory
→
https://bugzilla.redhat.com/show_bug.cgi?id=1908845Issue Tracking · Patch · Third Party Advisory
→
https://lists.debian.org/debian-lts-announce/2021/02/msg00032.htmlMailing List · Third Party Advisory
→
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-4852Third Party Advisory
→
https://www.openwall.com/lists/oss-security/2021/02/10/4Mailing List · Patch · Third Party Advisory

Quick Facts

CVE IDCVE-2020-35498
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-400
CISA KEVNo
Affected3 vendor(s)
PublishedFeb 11, 2021

Related CVEs (CWE-400)

CVE-2017-1000378
9.8
CVE-2015-4412
9.8
CVE-2013-20004
9.8
CVE-2025-61303
9.8
CVE-2025-43193
9.8
CVE-2018-16491
9.8

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2020-35498 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.
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