CVE-2024-31949Network attack vector

BGP daemon hang via unadvanced capability pointer

Published Apr 7, 2024 · Updated Nov 4, 2025

Infinite-loop handling in FRRouting FRR 9.1.0 allows remote attackers to hang bgpd with a malformed MP/GR dynamic capability. The bgp_capability_msg_parse function takes error paths for invalid multiprotocol or graceful-restart capability data without advancing pnt, causing the parser to revisit the same bytes indefinitely. Reachability requires bgpd to process a dynamic-capability message from a BGP peer; the resulting hang interrupts routing service without disclosed data access or modification.

CVSS severity6.5
Medium
EPSS probability0.70%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Infinite-loop handling in FRRouting FRR 9.1.0 allows remote attackers to hang bgpd with a malformed MP/GR dynamic capability. The bgp_capability_msg_parse function takes error paths for invalid multiprotocol or graceful-restart capability data without advancing pnt, causing the parser to revisit the same bytes indefinitely. Reachability requires bgpd to process a dynamic-capability message from a BGP peer; the resulting hang interrupts routing service without disclosed data access or modification.

The record

CVE
CVE-2024-31949
Published
Apr 7, 2024
Updated
Nov 4, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-835, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 7, 2024CVE publishedPublication date reported by the CVE source.
  2. Nov 4, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-835Loop with Unreachable Exit Condition ('Infinite Loop')
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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