NCSC-2026-0337 [1.00] [H/H] Zero-Day vulnerabilities patched in SonicWall SMA1000 Appliance
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
SonicWall has patched vulnerabilities in the SMA1000 Appliance. The SMA1000 Appliance contains two vulnerabilities. The first is a pre-authentication Server-Side Request Forgery (SSRF) in the Work Place interface, which allows an external, unauthenticated attacker to perform unauthorized actions. The second vulnerability concerns post-authentication remote code execution, whereby an attacker with valid credentials can execute arbitrary code remotely. Both vulnerabilities have been exploited as zero-days. The NCSC recommends that organizations follow the advisory from SonicWall
CSIRTS triage
- What
- A pre-authentication SSRF and post-authentication RCE vulnerability in the SMA1000 Appliance allow unauthorized actions and arbitrary code execution.
- Who is affected
- SonicWall SMA1000 Appliance deployments exposed to unauthenticated remote access.
- Urgency
- Critical; both vulnerabilities have been exploited as zero-days in active attacks.
- Action
- Apply SonicWall's patched firmware immediately.
AI-assisted analysis generated from the source advisory — verify against the original.
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Details
Original advisory: https://advisories.ncsc.nl/advisory?id=NCSC-2026-0337
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.
- Exploitation confirmedCVE-2026-83548Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 18% of all EPSS-scored CVEs.
- Exploitation confirmedCVE-2026-83549Already exploited in the wild (CISA KEV) — the prediction phase is over. Patch now. Riskier than 58% of all EPSS-scored CVEs.
Referenced CVEs
| CVE | CSIRTS overview | External |
|---|---|---|
| CVE-2026-83548 | coverage & exploitation status | NVD · CVE.org |
| CVE-2026-83549 | coverage & exploitation status | NVD · CVE.org |
Same CVEs, other sources
How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.
- unknownexploitedSonicWall security advisory (AV26-872) – Update 1cccs
- highexploitedCISA Adds Seven Known Exploited Vulnerabilities to Catalogcisa
- criticalexploited[NEW] [critical] SonicWall SMA: Multiple vulnerabilitiescert-bund
- criticalexploitedCVE-2026-83549: SonicWall SMA1000 Appliances OS Command Injection Vulnerabilitycisa-kev
- unknownexploitedMultiple vulnerabilities in SonicWall Secure Mobile Access (02 September 2026)cert-fr-alerte
- unknownexploitedMultiple vulnerabilities in SonicWall products (02 September 2026)cert-fr-avis
- criticalexploitedCVE-2026-83548: SonicWall SMA1000 Appliances Server-Side Request Forgery Vulnerabilitycisa-kev
- highexploitedCVE-2026-83549: Post-authentication Improper Neutralization of Special Elements used in an OS Command ('OS Com…nvd
- criticalexploitedCVE-2026-83548: A Pre-authentication SSRF vulnerability exists in the SMA1000 Appliance Work Place interface d…nvd
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