CVE-2023-38406

CRITICALNVD 9.89.8—

9.8

bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."

CVSS v3: 9.8
EG Score: 9.8(medium)
EPSS: 28.2%
KEV: Not listed

Published

November 6, 2023

Last Modified

November 4, 2025

References (7)

cve@mitrehttps://github.com/FRRouting/frr/compare/frr-8.4.2...frr-8.4.3
cve@mitrehttps://github.com/FRRouting/frr/pull/12884
cve@mitrehttps://lists.debian.org/debian-lts-announce/2024/04/msg00019.html
af854a3a-2127-422b-91ae-364da2661108https://github.com/FRRouting/frr/compare/frr-8.4.2...frr-8.4.3
af854a3a-2127-422b-91ae-364da2661108https://github.com/FRRouting/frr/pull/12884
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/04/msg00019.html
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2024/09/msg00007.html

Patch Availability(8)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	frr-snmp (8.1-1ubuntu1.8) @ jammy	2026-05-24	ubuntu
ubuntu	frr-snmp (7.2.1-1ubuntu0.2+esm2) @ focal	2026-05-24	ubuntu
redhat	frr-0:8.0-5.el9_0.3	2024-03-05	redhat
redhat	frr-0:8.3.1-5.el9_2.4	2024-03-05	redhat
redhat	frr-0:7.5-11.el8_6.7	2024-03-05	redhat
redhat	frr-0:7.5.1-7.el8_8.5	2024-01-30	redhat
redhat	frr-0:8.3.1-11.el9_3.2	2024-01-25	redhat
redhat	frr-0:7.5.1-13.el8_9.3	2024-01-10	redhat

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.

Weakness Classification(1)

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

CWE-755Improper Handling of Exceptional Conditions

All Vendor Advisories

(8)

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 11× in last 7d / 11× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-05-27 13:39 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-26 07:18 UTCepss_batch
2026-05-24 16:52 UTCepss_batch
2026-05-24 14:28 UTCEG score recompute
2026-05-24 14:28 UTCVendor advisory
2026-05-24 14:28 UTCGHSA enrichment
2026-05-24 12:51 UTCOSV refresh

Frequently asked(5)

What is CVE-2023-38406?

CVE-2023-38406 is a critical vulnerability published on November 6, 2023. bgpd/bgp_flowspec.c in FRRouting (FRR) before 8.4.3 mishandles an nlri length of zero, aka a "flowspec overflow."

When was CVE-2023-38406 disclosed?

CVE-2023-38406 was first published in the National Vulnerability Database on November 6, 2023, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2023-38406 actively exploited?

CVE-2023-38406 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 28.2% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2023-38406?

CVE-2023-38406 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2023-38406?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-38406, 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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CVE-2023-38406

Published

Last Modified

References (7)

Patch Availability(8)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-38406?

Same vendor

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CVE-2023-38406

📅 Published

🔄 Last Modified

🔗 References (7)

Patch Availability(8)

Weakness Classification(1)

All Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2023-38406?

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