CVE-2017-9264

CRITICALNVD 9.89.8
EchelonGraph scoreMEDIUM confidence

“—” beside the score: it is equal to NVD's CVSS score.

Score 9.8 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-13. NVD baseline CVSS 9.8; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: EPSS, GitHub Security Advisory, NVD CVSS v3
9.8EG
EchelonGraph verdictPlan a fixRemediate within your standard update timelines (the SSVC decision on this page).
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 2.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In 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, and IPv6 packets in the functions extract_l3_ipv6, extract_l4_tcp, and extract_l4_udp that can be triggered remotely.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
45
EG Risk 45/100

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 (value × EchelonGraph’s weight)
Severity98% × 45%
The EG Score, 9.8 of 10.
Exploitation2.4% × 40%
FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.
Automatability0% × 15%
CISA's BOD 26-04 default: no one has published Automatable for this CVE, and CISA treats it as “no” for a CVE not in KEV.
SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).
Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.
Action: A fix is available. Apply it within your standard update timelines.
EPSS PROB
2.4%
EPSS %ILE
83rd
KEV
Not listed

SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines.

Exploitation none (no CISA value, KEV listing or exploit code on record) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). EchelonGraph holds no SSVC assessment of this CVE from CISA: none of these inputs is from Vulnrichment. EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table

BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.

In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA's BOD 26-04 default) · Technical impact total (CISA's BOD 26-04 default). Where an input reads “CISA's BOD 26-04 default”, no one has published it for this CVE, and CISA's implementation guidance says: “If “Automatable” and “Technical Impact” information items about a CVE ID are not available and the CVE ID is not in the KEV Catalog, CISA will treat its values as “no” and “total,” respectively, until CISA or a third party provides metadata about the CVE ID. CISA will always provide the Vulnrichment data for a CVE ID listed in the KEV Catalog.” Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it

Published

May 29, 2017

Last Modified

June 17, 2026

Advisory Details (4)

Auto-updated Oct 5, 2026
Patch available. Sources: redhat.
Web page

[ovs-dev] [PATCH] conntrack: Fix checks for TCP, UDP, and IPv6 header sizes.

https://mail.openvswitch.org/pipermail/ovs-dev/2017-March/329323.html
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2017:2727
Red HatMentions a patch (unverified)
https://access.redhat.com/errata/RHSA-2017:2648
Red HatMentions a patch (unverified)

Affected: Red Hat Enterprise Linux 7.

https://access.redhat.com/errata/RHSA-2017:2418

Patch Availability(3)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntuopenvswitch-common (2.6.1-0ubuntu5.1) @ zesty2026-05-20ubuntu
redhatopenvswitch-0:2.6.1-13.git20161206.el7ost2017-09-13redhat
redhatopenvswitch-0:2.7.2-1.git20170719.el7fdp2017-08-03redhat

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

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.8.1+dfsg1-2: fixed in 2.8.1+dfsg1-2
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.8.1+dfsg1-2: fixed in 2.8.1+dfsg1-2
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.8.1+dfsg1-2: fixed in 2.8.1+dfsg1-2
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
openvswitch—
  • every version up to 2.8.1+dfsg1-2: fixed in 2.8.1+dfsg1-2
—

Weakness Classification(1)

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

All Vendor Advisories

(4)

Every vendor that published an advisory referencing this CVE — pulled from our cve_vendor_advisories aggregation. Click any row for the vendor's original advisory page.

Data Freshness Timeline

(refreshed 8× in last 7d / 26× in last 30d)

Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.

Showing the most recent 83 of 191 refreshes on record for this CVE.

A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. 17 repeat rows among the latest 100 are merged into the row they repeat. The 108 oldest rows on record are not shown and were not checked, so the counts can still include repeats.

  1. 2026-10-12 00:47 UTCEG score recompute
  2. 2026-10-11 13:41 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  3. 2026-10-10 19:55 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  9. 2026-10-04 23:18 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  10. 2026-10-03 19:21 UTCOSV refresh
  11. 2026-10-03 14:21 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  12. 2026-09-30 14:59 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  13. 2026-09-30 09:49 UTCEG score recompute
  14. 2026-09-28 13:45 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  15. 2026-09-27 13:40 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  16. 2026-09-26 15:53 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  18. 2026-09-24 13:59 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  19. 2026-09-23 13:42 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  20. 2026-09-21 20:27 UTCEPSS rescoreEPSS 2.2% · 81st percentile
  21. 2026-09-19 15:36 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  22. 2026-09-17 19:22 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  23. 2026-09-15 03:05 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  24. 2026-09-14 09:20 UTCOSV refresh
  25. 2026-09-13 16:42 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
Show 58 more
  1. 2026-09-12 14:56 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  2. 2026-09-11 09:31 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  3. 2026-09-05 15:24 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  4. 2026-09-04 13:56 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  5. 2026-09-04 05:02 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
  6. 2026-09-02 14:07 UTCEPSS rescoreEPSS 2.4% · 83rd percentile
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  9. 2026-08-28 21:36 UTCEPSS rescoreEPSS 2.2% · 80th percentile
  10. 2026-08-27 14:21 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  11. 2026-08-26 14:41 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  12. 2026-08-26 10:32 UTCOSV refresh
  13. 2026-08-25 13:44 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  14. 2026-08-23 00:14 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  15. 2026-08-21 23:44 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
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  17. 2026-08-18 13:43 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  18. 2026-08-16 14:51 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  19. 2026-08-16 02:10 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  20. 2026-08-15 01:26 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  21. 2026-08-12 13:46 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  22. 2026-08-10 00:10 UTCOSV refresh
  23. 2026-08-09 13:42 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  24. 2026-08-08 16:32 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  25. 2026-08-07 16:22 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  26. 2026-08-06 13:42 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  27. 2026-08-05 19:13 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  28. 2026-08-02 02:23 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
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  33. 2026-07-26 14:51 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  34. 2026-07-25 00:41 UTCOSV refresh
  35. 2026-07-23 14:15 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  36. 2026-07-23 01:31 UTCEG score recompute
  37. 2026-07-22 22:11 UTCEG score recompute
  38. 2026-07-22 14:04 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  39. 2026-07-21 15:21 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  40. 2026-07-20 17:04 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
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  44. 2026-07-16 16:59 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  45. 2026-07-15 16:54 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  46. 2026-07-15 01:56 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  47. 2026-07-13 22:26 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  48. 2026-07-12 05:43 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
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  50. 2026-07-09 19:06 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  51. 2026-07-08 15:11 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
  52. 2026-07-07 19:42 UTCOSV refresh
  53. 2026-07-07 13:42 UTCEPSS rescoreEPSS 2.4% · 82nd percentile
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  58. 2026-07-02 16:54 UTCEPSS rescoreEPSS 2.4% · 82nd percentile

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Frequently asked(5)

What is CVE-2017-9264?
CVE-2017-9264 is a critical-severity vulnerability; its CVE record was published on May 29, 2017. In 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, and IPv6 packets in the functions extractl3ipv6, extractl4tcp, and extractl4udp that can be triggered remotely.
When was CVE-2017-9264 made public?
CVE-2017-9264 was made public on May 28, 2017: that is the date its CVE record's CNA, MITRE Corporation, gives for when the vulnerability was made public. The CVE record itself was published on May 29, 2017. EchelonGraph's copy of the record carries a last-modified date of June 17, 2026; the record at its source may have been updated since.
Is CVE-2017-9264 actively exploited?
CVE-2017-9264 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 2.4% probability of exploitation in the next 30 days (83rd percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2017-9264?
CVE-2017-9264 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2017-9264?
A fix for CVE-2017-9264 is available: update to the fixed version the vendor names in its advisory.

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