FRRouting FRR 10.0/10.6 BGP integer underflow

CVSS Meta Temp Score
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CTI Interest Score
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7.3$0-$5k0.00

Summaryinfo

A vulnerability was found in FRRouting FRR 10.0/10.6. It has been rated as critical. This vulnerability affects unknown code of the component BGP Handler. The manipulation leads to integer underflow. This vulnerability is uniquely identified as CVE-2026-37459. The attack is possible to be carried out remotely. No exploit exists. To fix this issue, it is recommended to deploy a patch.

Detailsinfo

A vulnerability was found in FRRouting FRR 10.0/10.6 and classified as critical. This issue affects an unknown function of the component BGP Handler. The manipulation with an unknown input leads to a integer underflow vulnerability. Using CWE to declare the problem leads to CWE-191. The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result. Impacted is availability. The summary by CVE is:

An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to cause a Denial of Service (DoS) via supplying a crafted BGP UPDATE message.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-37459 since 04/06/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. The technical details are unknown and an exploit is not publicly available.

The vulnerability scanner Nessus provides a plugin with the ID 319644 (RHEL 10 : frr (RHSA-2026:24347)), which helps to determine the existence of the flaw in a target environment.

Applying the patch 693a2e02687cdc9d16501275e05136edea9650d9 is able to eliminate this problem. The bugfix is ready for download at github.com.

The vulnerability is also documented in the databases at Tenable (319644) and CERT Bund (WID-SEC-2026-1353). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

  • Debian Linux
  • Red Hat Enterprise Linux
  • SUSE Linux
  • SUSE openSUSE
  • RESF Rocky Linux
  • Microsoft Azure Linux
  • FRRouting Project FRRouting

Productinfo

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 7.3

VulDB Base Score: 7.5
VulDB Temp Score: 7.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

ADP CISA Base Score: 7.5
ADP CISA Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Integer underflow
CWE: CWE-191 / CWE-189
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 319644
Nessus Name: RHEL 10 : frr (RHSA-2026:24347)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔒

Patch: 693a2e02687cdc9d16501275e05136edea9650d9

Timelineinfo

04/06/2026 CVE reserved
05/04/2026 +28 days Advisory disclosed
05/04/2026 +0 days VulDB entry created
06/19/2026 +46 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: 693a2e02687cdc9d16501275e05136edea9650d9
Status: Confirmed

CVE: CVE-2026-37459 (🔒)
GCVE (CVE): GCVE-0-2026-37459
GCVE (VulDB): GCVE-100-361067
CERT Bund: WID-SEC-2026-1353 - FRRouting Project FRRouting: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 05/04/2026 23:07
Updated: 06/19/2026 09:45
Changes: 05/04/2026 23:07 (66), 06/08/2026 14:10 (3), 06/19/2026 09:45 (7)
Complete: 🔍
Cache ID: 216::103

Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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