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No exploitation reportedFix available

CVE-2021-3905

No exploitation reported by the sources we read.

  • Published2022-08-23
  • Fixed in2.17.0
  • WeaknessCWE-401

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.

Timeline

dates in UTC
  1. 2022-08-2316:15CVE publishedNVD

Versions per branch

NVD
Openvswitch
BranchAffectedFixed in
2.17< 2.17.02.17.0
Redhat enterprise linux fast datapath
BranchAffectedFixed in
7.0= 7.0no fix published
8.0= 8.0no fix published
Canonical ubuntu linux
BranchAffectedFixed in
21.10= 21.10no fix published

1 more product in the sources.

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • openvswitchopenEuler:22.03-LTSall versions · fixed in 2.12.0-22.oe2203
  • openvswitchopenEuler:20.03-LTS-SP3all versions · fixed in 2.12.0-18.oe1
  • openvswitchopenEuler:20.03-LTS-SP1all versions · fixed in 2.12.0-16.oe1
  • openvswitch2.13Red Hat:enterprise_linux:8::fastdatapathall versions · fixed in 0:2.13.0-139.el8fdpand 8 other packages
  • openvswitch2.15Red Hat:enterprise_linux:8::fastdatapathall versions · fixed in 0:2.15.0-55.el8fdpand 8 other packages
  • openvswitch2.16Red Hat:enterprise_linux:8::fastdatapathall versions · fixed in 0:2.16.0-86.el8fdpand 8 other packages

Vendor advisories

  • CVE-2021-3905 Red Hat Product Security86 products fixed · 47 known affected

    openvswitch: External triggered memory leak in Open vSwitch while processing fragmented packets

    openvswitch2.12 as a component of Fast Datapath for RHEL 7 · openvswitch2.12-devel as a component of Fast Datapath for RHEL 7 · openvswitch2.12-test as a component of Fast Datapath for RHEL 7 · +44 more

  • RHBA-2022:5792 Red Hat Product Security34 products fixed

    Red Hat Bug Fix Advisory: openvswitch2.16 bug fix and enhancement update

  • RHBA-2022:0052 Red Hat Product Security26 products fixed

    Red Hat Bug Fix Advisory: openvswitch2.15 update

  • RHBA-2022:0051 Red Hat Product Security26 products fixed

    Red Hat Bug Fix Advisory: openvswitch2.13 update

Full record on NVD

Fix

  1. Update Openvswitch to 2.17.0
  2. Vendor fix Red Hat Product Security RHBA-2022:5792 · 34 productsBefore applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  3. Vendor fix Red Hat Product Security RHBA-2022:0052 · 26 productsFor details on how to apply this update, refer to: https://access.redhat.com/articles/11258
  4. No fix planned, says the vendor Red Hat Product Security CVE-2021-3905 · 21 productsOut of support scope
  5. No fix planned, says the vendor Red Hat Product Security CVE-2021-3905 · 26 productsWill not fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • NVDCVSS 3.17.5read 2026-10-23
  • CNAweakness (CWE)CWE-401known since 2026-10-23
  • NVDweakness (CWE)CWE-401read 2026-10-23
  • FIRST EPSSEPSS score2.1 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Published
2022-08-23
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-w2f8-jf7v-2cj4

Frequently asked questions

What is CVE-2021-3905?

A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An attacker could use this flaw to potentially exhaust available memory by keeping sending packet fragments.

Is CVE-2021-3905 actively exploited?

Active exploitation of CVE-2021-3905 has not been confirmed. Its EPSS score was 2.1% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2021-3905?

CVE-2021-3905 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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