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CVE-2021-3905

A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An...

7.5 HighFix available

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
None
Integrity
None
Availability
High

Exploit likelihood

2.13%Up 1.2 points since Aug 24, 2022
90%50%10%1%

What each source reports

NVD Score used 7.5

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.

Record
CVE-2021-3905
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-401
Updated
2026-11-02
CVE List No score

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.

Record
CVE-2021-3905
Weakness
CWE-401
Updated
2026-11-02
EUVDEUVD-2021-27133 No score

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.

Record
EUVD-2021-27133
Updated
2026-11-03
GitHub AdvisoriesGHSA-w2f8-jf7v-2cj4 7.5

A memory leak was found in Open vSwitch (OVS) during userspace IP fragmentation processing. An...

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.

Record
GHSA-w2f8-jf7v-2cj4
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weakness
CWE-401
Updated
2026-11-02
OSV 7.5

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.

Record
CVE-2021-3905
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVOESA-2022-1778 7.5

openvswitch security update

Open vSwitch is a production quality, multilayer virtual switch licensed under the open source Apache 2.0 license.

Security Fix(es):

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.(CVE-2021-3905)

Record
OESA-2022-1778
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
Show 4 moreShow less
OSVRHBA-2022:0051 7.5

Red Hat Bug Fix Advisory: openvswitch2.13 update

Record
RHBA-2022:0051
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHBA-2022:0052 7.5

Red Hat Bug Fix Advisory: openvswitch2.15 update

Record
RHBA-2022:0052
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVRHBA-2022:5792 7.5

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

Record
RHBA-2022:5792
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02
OSVUBUNTU-CVE-2021-3905 7.5

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.

Record
UBUNTU-CVE-2021-3905
CVSS 3.1
7.5 HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
openvswitch
openEuler:20.03-LTS-SP1
 before 2.12.0-16.oe1
2.12.0-16.oe1
openvswitch
openEuler:20.03-LTS-SP3
 before 2.12.0-18.oe1
2.12.0-18.oe1
openvswitch
openEuler:22.03-LTS
 before 2.12.0-22.oe2203
2.12.0-22.oe2203
network-scripts-openvswitch2.13
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
openvswitch2.13
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
openvswitch2.13-debuginfo
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
openvswitch2.13-debugsource
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
openvswitch2.13-devel
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
openvswitch2.13-ipsec
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
openvswitch2.13-test
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
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Affected packages
PackageAffectedFixed
python3-openvswitch2.13
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
python3-openvswitch2.13-debuginfo
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.13.0-139.el8fdp
0:2.13.0-139.el8fdp
network-scripts-openvswitch2.15
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
openvswitch2.15
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
openvswitch2.15-debuginfo
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
openvswitch2.15-debugsource
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
openvswitch2.15-devel
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
openvswitch2.15-ipsec
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
openvswitch2.15-test
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
python3-openvswitch2.15
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
python3-openvswitch2.15-debuginfo
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.15.0-55.el8fdp
0:2.15.0-55.el8fdp
network-scripts-openvswitch2.16
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
openvswitch2.16
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
openvswitch2.16-debuginfo
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
openvswitch2.16-debugsource
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
openvswitch2.16-devel
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
openvswitch2.16-ipsec
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
openvswitch2.16-test
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
python3-openvswitch2.16
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp
python3-openvswitch2.16-debuginfo
Red Hat:enterprise_linux:8::fastdatapath
 before 0:2.16.0-86.el8fdp
0:2.16.0-86.el8fdp

History

History
RecordedChangedSources
affected
aliasesEUVD
first indexedCVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2021-3905 is a high vulnerability (CVSS 7.5) in Canonical Ubuntu Linux, published November 8, 2021. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.13%, the 82nd percentile. Fixed in openvswitch 2.12.0-16.oe1.

References

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