CVE-2026-11736 — Stack-based buffer overflow vulnerability in some NETGEAR Nighthawk routers

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

1. Identify exposed assets running the affected vendor/product/version combinations (NETGEAR RAX20, Netgear Rax20 Firmware, NETGEAR RAX35v2…).
2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
3. Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-787 · Out-of-bounds Write

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

• Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
• Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

Timeline

What happened to this CVE, newest first.

• 2026
• Affected products added · netgear/rax20, netgear/rax35v2, netgear/rax41, netgear/rax41v2, netgear/rax42, netgear/rax42v2, netgear/rax43, netgear/r
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• SSVC assessment updated
  Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
• Record published
  Oct 15, 2026
• CVSS changed · 4.9
  Oct 15, 2026 · NIST National Vulnerability Database
• Source status changed · → Analyzed
  Oct 15, 2026 · NIST National Vulnerability Database
• Record created in this database
  Oct 15, 2026 · NIST National Vulnerability Database
• CVE published
  Aug 11, 2026 · NETGEAR

Source activity

Repeated readings are counted rather than listed.

• 1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

19 on the record

• kb.netgear.com/000070887/August-2026-NETGEAR-Security-Advisory
  Vendor Advisory, vendor-advisory, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax50v2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax42/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/xr1000v2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax50/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax43/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/raxe500/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax54sv2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax35v2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax41v2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/xr1000/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax50s/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax49s/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax43v2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax42v2/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax45/
  Product, product, patch, NIST National Vulnerability Database
• www.netgear.com/support/product/rax20/
  Product, product, NIST National Vulnerability Database
• www.netgear.com/support/product/raxe450/
  Product, product, NIST National Vulnerability Database
• www.netgear.com/support/product/rax41/
  Product, product, NIST National Vulnerability Database

Elsewhere on this site

Related CVEs (same products)

• Medium CVE-2026-9215 A CSRF vulnerability exists in certain NETGEAR XR series devices Sep 8, 2026
• Medium CVE-2026-11738 Insufficient input validation in certain NETGEAR Nighthawk routers allows administrators to tamper with the device. Aug 11, 2026
• Medium CVE-2026-11814 Command injection vulnerability in certain NETGEAR Nighthawk and Orbi routers Aug 11, 2026
• Medium CVE-2026-11739 Command injection vulnerability in some NETGEAR Nighthawk devices Aug 11, 2026
• Medium CVE-2026-11737 Some NETGEAR Nighthawk devices allow administrators to tamper with the device Aug 11, 2026
• Low CVE-2026-11734 Device administrator can interrupt the normal operation of some NETGEAR Nighthawk devices. Aug 11, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

• No fixed version, patch or mitigation documented.
• No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
• No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
• No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-11736 is "Stack-based buffer overflow vulnerability in some NETGEAR Nighthawk routers", rated Medium. It affects RAX20 (NETGEAR); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 4.9 describes technical severity. EPSS 0.51% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

Comments

Moderated technical discussion. Read the community guidelines.

No comments yet.

Sign in or create an account to comment and suggest corrections.