CVE-2023-1668

HIGHNVD 8.28.2—
EchelonGraph scoreMEDIUM confidence

Score 8.2 from GitHub Security Advisory (severity: HIGH) published 2023-04-11. NVD baseline CVSS 8.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.2EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 8.2Exploit: None knownExposed: 0

A fix is available — apply it.

A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is wildcarded) for this flow, but with an incorrect action, possibly causing incorrect handling of other IP packets with a != 0 IP protocol that matches this dp flow.

CVSS v3
8.2
EG Score
8.2(medium)
EG Risk
52(Track)
EG Risk 52/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity82% × 45%
Exploitation1% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
67%
KEV
Not listed

Published

April 10, 2023

Last Modified

April 23, 2025

Advisory Details (5)

Auto-updated Sep 8, 2026
Patch available. Sources: redhat.
generic

Open vSwitch: Multiple Vulnerabilities (GLSA 202311-16) — Gentoo security

https://security.gentoo.org/glsa/202311-16
generic

[SECURITY] Fedora 38 Update: openvswitch-3.1.1-1.fc38 - package-announce - Fedora mailing-lists

https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/V2GUNS3WSJG4TUDKZ5L7FXGJMVOD6EJZ/
generic Patch Available

[SECURITY] [DLA 3410-1] openvswitch security update

https://lists.debian.org/debian-lts-announce/2023/05/msg00000.html
redhat Patch Available

2137666 – (CVE-2023-1668) CVE-2023-1668 openvswitch: ip proto 0 triggers incorrect handling

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=2137666
generic

oss-security - [ADVISORY] CVE-2023-1668: Open vSwitch: Remote traffic denial of service via crafted packets with IP proto 0

https://www.openwall.com/lists/oss-security/2023/04/06/1

Vendor Advisories for CVE-2023-1668(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Patch Availability(8)

Vendor / EcosystemFixed in / PatchReleasedSource
ubuntuopenvswitch-test (3.0.3-0ubuntu0.22.10.3) @ kinetic2026-05-25ubuntu
redhatredhat-virtualization-host-0:4.5.3-202306050942_8.62023-06-06redhat
redhatopenvswitch2.13-0:2.13.0-214.el8fdp2023-04-18redhat
redhatopenvswitch2.15-0:2.15.0-136.el8fdp2023-04-18redhat
redhatopenvswitch2.17-0:2.17.0-77.el9fdp2023-04-13redhat
redhatopenvswitch3.1-0:3.1.0-14.el9fdp2023-04-13redhat
redhatopenvswitch2.17-0:2.17.0-88.el8fdp2023-04-13redhat
redhatopenvswitch3.1-0:3.1.0-17.el8fdp2023-04-13redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(5 across 5 ecosystems)
Debian:10(1)
PackageVulnerable rangeFixed inDependents
openvswitch2.10.0+2018.08.28+git.8ca7c82b7d+ds1-12 ... 2.10.7+ds1-0+deb10u3 (8 versions)2.10.7+ds1-0+deb10u4—
Debian:11(1)
PackageVulnerable rangeFixed inDependents
openvswitch2.15.0+ds1-2, 2.15.0+ds1-2+deb11u1, 2.15.0+ds1-2+deb11u2, 2.15.0+ds1-2+deb11u32.15.0+ds1-2+deb11u4—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
openvswitch—3.1.0-2—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
openvswitch—3.1.0-2—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
openvswitch—3.1.0-2—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Additional Vendor Advisories

(8)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 8× in last 7d / 29× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 160 total refreshes for this CVE.

  1. 2026-09-07 15:59 UTCEPSS rescore
  2. 2026-09-06 13:45 UTCEPSS rescore
  3. 2026-09-05 15:25 UTCEPSS rescore
  4. 2026-09-04 13:58 UTCEPSS rescore
  5. 2026-09-04 13:57 UTCEPSS rescore
  6. 2026-09-04 09:59 UTCOSV refresh
  7. 2026-09-04 05:04 UTCEPSS rescore
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  10. 2026-08-30 19:15 UTCEPSS rescore
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  12. 2026-08-28 21:38 UTCEPSS rescore
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  19. 2026-08-20 22:53 UTCEPSS rescore
  20. 2026-08-19 17:01 UTCEPSS rescore
  21. 2026-08-18 13:46 UTCEPSS rescore
  22. 2026-08-17 20:30 UTCOSV refresh
  23. 2026-08-17 13:44 UTCEPSS rescore
  24. 2026-08-16 14:53 UTCEPSS rescore
  25. 2026-08-16 02:12 UTCEPSS rescore
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  1. 2026-08-15 01:28 UTCEPSS rescore
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  3. 2026-08-13 21:58 UTCEPSS rescore
  4. 2026-08-12 13:48 UTCEPSS rescore
  5. 2026-08-09 13:44 UTCEPSS rescore
  6. 2026-08-08 16:34 UTCEPSS rescore
  7. 2026-08-07 16:24 UTCEPSS rescore
  8. 2026-08-06 13:44 UTCEPSS rescore
  9. 2026-08-05 19:15 UTCEPSS rescore
  10. 2026-08-04 15:07 UTCEPSS rescore
  11. 2026-08-04 10:35 UTCEPSS rescore
  12. 2026-08-03 10:34 UTCEPSS rescore
  13. 2026-08-02 16:27 UTCOSV refresh
  14. 2026-08-02 02:24 UTCEPSS rescore
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  16. 2026-08-01 04:13 UTCEPSS rescore
  17. 2026-07-30 16:26 UTCEPSS rescore
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  20. 2026-07-28 15:34 UTCEPSS rescore
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  23. 2026-07-25 14:16 UTCEPSS rescore
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  25. 2026-07-24 14:15 UTCEPSS rescore
  26. 2026-07-23 14:16 UTCEPSS rescore
  27. 2026-07-23 14:16 UTCEPSS rescore
  28. 2026-07-23 02:17 UTCEG score recompute
  29. 2026-07-22 23:05 UTCEG score recompute
  30. 2026-07-22 14:06 UTCEPSS rescore
  31. 2026-07-21 15:23 UTCEPSS rescore
  32. 2026-07-20 17:05 UTCEPSS rescore
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  39. 2026-07-16 17:01 UTCEPSS rescore
  40. 2026-07-16 17:01 UTCEPSS rescore
  41. 2026-07-15 23:53 UTCOSV refresh
  42. 2026-07-15 16:56 UTCEPSS rescore
  43. 2026-07-15 01:58 UTCEPSS rescore
  44. 2026-07-15 01:58 UTCEPSS rescore
  45. 2026-07-13 22:28 UTCEPSS rescore
  46. 2026-07-13 22:28 UTCEPSS rescore
  47. 2026-07-12 05:45 UTCEPSS rescore
  48. 2026-07-12 05:45 UTCEPSS rescore
  49. 2026-07-11 08:25 UTCEPSS rescore
  50. 2026-07-11 08:25 UTCEPSS rescore
  51. 2026-07-09 19:08 UTCEPSS rescore
  52. 2026-07-08 15:13 UTCEPSS rescore
  53. 2026-07-07 13:44 UTCEPSS rescore
  54. 2026-07-06 16:26 UTCEPSS rescore
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  57. 2026-07-05 02:28 UTCEPSS rescore
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  60. 2026-07-02 16:58 UTCEPSS rescore
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  62. 2026-06-30 23:21 UTCEPSS rescore
  63. 2026-06-29 14:04 UTCEPSS rescore
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  66. 2026-06-28 04:54 UTCEPSS rescore
  67. 2026-06-28 04:54 UTCEPSS rescore
  68. 2026-06-28 00:34 UTCOSV refresh
  69. 2026-06-27 03:07 UTCEPSS rescore
  70. 2026-06-25 13:48 UTCEPSS rescore
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  72. 2026-06-24 14:03 UTCEPSS rescore
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  74. 2026-06-23 21:31 UTCEPSS rescore
  75. 2026-06-23 21:31 UTCEPSS rescore

Frequently asked(5)

What is CVE-2023-1668?
CVE-2023-1668 is a high vulnerability published on April 10, 2023. A flaw was found in openvswitch (OVS). When processing an IP packet with protocol 0, OVS will install the datapath flow without the action modifying the IP header. This issue results (for both kernel and userspace datapath) in installing a datapath flow matching all IP protocols (nw_proto is…
When was CVE-2023-1668 disclosed?
CVE-2023-1668 was first published in the National Vulnerability Database on April 10, 2023, with the most recent update on April 23, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-1668 actively exploited?
CVE-2023-1668 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 33.4% of all scored CVEs.
What is the CVSS score of CVE-2023-1668?
CVE-2023-1668 has a CVSS v3 base score of 8.2 (NVD).
How do I remediate CVE-2023-1668?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-1668, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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