An integer underflow in FRRouting (FRR) stable/10.0 to stable/10.6 allows attackers to…
Priority LOW 39CWE-400Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Denial of service
- Confidentiality · integrity · availability
- None · None · High
- Fix status
- Partial Red Hat: 2 fixed, 2 without a fix
Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-400.
Summary
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.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00371 31st percentileScored 2026-11-07
Fix Partial Red Hat: 2 advisoriesRed Hat: 2 fixed, 2 without a fix
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- Yes
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
Remediation
Red Hat 2 advisories
- RHSA-2026:24370 Released 2026-06-08 · Red Hat rating Importantfrr10 security update
- Red Hat Enterprise Linux AppStream (v. 9) frr10-10.4.3-3.el9_8, frr10-selinux-10.4.3-3.el9_8
- RHSA-2026:24347 Released 2026-06-08 · Red Hat rating Importantfrr security update
- Red Hat Enterprise Linux AppStream (v. 10) frr-10.4.4-1.el10_2, frr-selinux-10.4.4-1.el10_2
Vendor assessments
Red Hat
Red Hat rating: Important. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 8 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux 9 | Affected | No fix planned: Will not fix |
| Red Hat Enterprise Linux AppStream (v. 10) | Fixed | RHSA-2026:24347 |
| Red Hat Enterprise Linux AppStream (v. 9) | Fixed | RHSA-2026:24370 |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-37459
- 2026-10-03 Alias added: GHSA-hmpg-chwg-jvg8
- 2026-10-25 EPSS moved to the below the 50th percentile
- 2026-10-25 Priority changed: MEDIUM → LOW
Sources
- CVE-2026-37459 · CVE Program
- CVE-2026-37459 · NVD
- FIRST EPSS
- GHSA-hmpg-chwg-jvg8 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-37459 · Red Hat security data · CC BY 4.0
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