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Noroxi
NVD / CVE Program· CNA redhat

CVE-2023-3966: Openvswsitch: ovs-vswitch fails to recover after malformed geneve metadata packet

Noroxi assessment

Priority: Monitor (action score 30/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1% (FIRST EPSS); higher than 64% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: openvswitch (Debian:11) 2.15.0+ds1-2+deb11u5; openvswitch (Debian:12) 3.1.0-2+deb12u1; openvswitch (Debian:13) 3.3.0-1.

Low priority for now. Upgrade to openvswitch (Debian:11) 2.15.0+ds1-2+deb11u5; openvswitch (Debian:12) 3.1.0-2+deb12u1; openvswitch (Debian:13) 3.3.0-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

A flaw was found in Open vSwitch where multiple versions are vulnerable to crafted Geneve packets, which may result in a denial of service and invalid memory accesses. Triggering this issue requires that hardware offloading via the netlink path is enabled.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Feb 22, 2024
Updated
Jun 17, 2026
EPSS
1.0% · 64th percentile

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.0%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.5
CNA · redhat
7.5
agree

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2023-3966

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
openvswitchopenvswitch
fedoraprojectfedora

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • fedoraproject fedora39
  • fedoraproject fedora40
  • openvswitch openvswitchbefore 3.1.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (redhat). Independent of NVD's CPE analysis and usually ahead of it.

  • Fedora Fedora

    • all versionsaffected

  • n/a openvswitch

    • 3.1.0not affected

  • RDO OpenStack RDO

    • all versionsaffected

  • Red Hat Fast Datapath for RHEL 7

    • all versionsaffected
    • all versionsunknown
    • all versionsunknown
    • all versionsunknown
    • all versionsaffected

  • Red Hat Fast Datapath for RHEL 8

    • all versionsunknown
    • all versionsunknown
    • all versionsaffected
    • all versionsaffected
    • all versionsunknown
    • all versionsaffected
    • all versionsaffected

  • Red Hat Fast Datapath for RHEL 9

    • all versionsaffected
    • all versionsunknown
    • all versionsaffected
    • all versionsaffected

  • Red Hat Red Hat Enterprise Linux 7

    • all versionsaffected

  • Red Hat Red Hat OpenShift Container Platform 3.11

    • all versionsunknown

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:11openvswitchbefore 2.15.0+ds1-2+deb11u52.15.0+ds1-2+deb11u5
Debian:12openvswitchbefore 3.1.0-2+deb12u13.1.0-2+deb12u1
Debian:13openvswitchbefore 3.3.0-13.3.0-1
openSUSE:Leap 15.5openvswitchbefore 2.14.2-150400.24.23.12.14.2-150400.24.23.1
openSUSE:Leap 15.5openvswitch3before 3.1.0-150500.3.16.13.1.0-150500.3.16.1
openSUSE:Leap 15.6openvswitchbefore 3.1.7-150600.33.9.13.1.7-150600.33.9.1
openSUSE:Leap 15.6openvswitch3before 3.1.7-150500.3.25.13.1.7-150500.3.25.1
openSUSE:Tumbleweedopenvswitchbefore 3.1.0-19.13.1.0-19.1
Red Hat:enterprise_linux:8::fastdatapathnetwork-scripts-openvswitch2.17before 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathnetwork-scripts-openvswitch3.1before 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch2.17before 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch2.17-debuginfobefore 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch2.17-debugsourcebefore 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch2.17-develbefore 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch2.17-ipsecbefore 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch2.17-testbefore 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch3.1before 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch3.1-debuginfobefore 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch3.1-debugsourcebefore 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch3.1-develbefore 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch3.1-ipsecbefore 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathopenvswitch3.1-testbefore 0:3.1.0-96.el8fdp0:3.1.0-96.el8fdp
Red Hat:enterprise_linux:8::fastdatapathpython3-openvswitch2.17before 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp
Red Hat:enterprise_linux:8::fastdatapathpython3-openvswitch2.17-debuginfobefore 0:2.17.0-148.el8fdp0:2.17.0-148.el8fdp

+18

Same product

openvswitch: all records

Other highest-scoring records for the same primary product.

  • CVE-2016-2074Buffer overflow in lib/flow.c in ovs-vswitchd in Open vSwitch 2.2.x and 2.3.x before 2.3.3 and 2.4.x before 2.4.1 allows remote attackers to
    41Plan
  • CVE-2017-9265In Open vSwitch (OvS) v2.7.0, there is a buffer over-read while parsing the group mod OpenFlow message sent from the controller in `lib/ofp-
    40Plan
  • CVE-2017-9264In lib/conntrack.c in the firewall implementation in Open vSwitch (OvS) 2.6.1, there is a buffer over-read while parsing malformed TCP, UDP,
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2022-4338Jan 10, 2023 · An integer underflow in Organization Specific TLV was found in various versions of OpenvSwitch.
    39Monitor
  • ← EarlierCVE-2023-5366Oct 6, 2023 · Openvswitch don't match packets on nd_target field
    22Monitor
  • ← EarlierCVE-2024-22563Jan 19, 2024 · openvswitch 2.17.8 was discovered to contain a memory leak via the function xmalloc__ in openvswitch-2.17.8/lib/util.c.
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
debian:openvswitch3.1.0-2+deb12u1 · Debian:12Package registry (OSV)
opensuse:openvswitch2.14.2-150400.24.23.1 · openSUSE:Leap 15.5Package registry (OSV)
opensuse:openvswitch33.1.0-150500.3.16.1 · openSUSE:Leap 15.5Package registry (OSV)
red hat:network-scripts-openvswitch2.170:2.17.0-148.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:openvswitch2.170:2.17.0-148.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:openvswitch2.17-debuginfo0:2.17.0-148.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:openvswitch2.17-debugsource0:2.17.0-148.el8fdp · Red Hat:enterprise_linux:8::fastdatapathPackage registry (OSV)
red hat:openvswitch3.10:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:openvswitch3.1-debuginfo0:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:openvswitch3.1-debugsource0:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:openvswitch3.1-devel0:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:openvswitch3.1-ipsec0:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:openvswitch3.1-test0:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:python3-openvswitch3.10:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
red hat:python3-openvswitch3.1-debuginfo0:3.1.0-88.el9fdp · Red Hat:enterprise_linux:9::fastdatapathPackage registry (OSV)
suse:openvswitch2.13.2-150200.9.34.1 · SUSE:Linux Enterprise High Performance Computing 15 SP2-LTSSPackage registry (OSV)
suse:openvswitch2.14.2-150400.24.23.1 · SUSE:Linux Enterprise Module for Legacy 15 SP5Package registry (OSV)
suse:openvswitch33.1.0-150500.3.16.1 · SUSE:Linux Enterprise Micro 5.5Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-248 · Uncaught Exception

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (3 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records