Multiple vulnerabilities in SonicWall NetExtender (August 26, 2026)

unknownCVE-2026-66152 CVE-2026-66153

Multiple vulnerabilities have been discovered in SonicWall NetExtender. They allow an attacker to cause security policy bypass.

CSIRTS triage

vendor: SonicWall product: NetExtenderMisconfiguration

What: Multiple security policy bypass vulnerabilities in SonicWall NetExtender.
Who is affected: SonicWall NetExtender users.
Urgency: Moderate; policy bypass impact present.
Action: Apply SonicWall NetExtender security updates.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: CERT-FR Avis de sécurité (FR · national-cert · site)
Severity: unknown
Published: 2026-08-26
Exploitation: Not in CISA KEV at last sync
Language: Machine-translated to English — verify against the original

Original advisory: https://www.cert.ssi.gouv.fr/avis/CERTFR-2026-AVI-1084/

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-661520.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.
Low exploitation riskCVE-2026-661530.20% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 9% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-66152	coverage & exploitation status	NVD · CVE.org
CVE-2026-66153	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for SonicWall NetExtender

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

highCVE-2026-66153: The NEService auto-upgrade process insecurely handles temporary files in SonicWall NetExtender…nvd · 2026-08-25
highCVE-2026-66152: A Path traversal vulnerability in OPSWAT tarball in the SonicWall NetExtender Linux client all…nvd · 2026-08-25