CVE-2026-0400
CVE-2026-0400 is a medium-severity vulnerability in Sonicwall Sonicos with a CVSS 3.x base score of 4.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-134.
Key facts
- Severity: Medium (CVSS 3.x base score 4.9)
- EPSS exploit prediction: 0% (34th percentile)
- Actively exploited: Not listed in CISA KEV
- EU (EUVD) id: EUVD-2026-8524
- Weakness: CWE-134
- Affected product: Sonicwall Sonicos
- Published:
- Last modified:
Description
A post-authentication Format String vulnerability in SonicOS allows a remote attacker to crash a firewall.
Frequently asked questions
- What is CVE-2026-0400?
- A post-authentication Format String vulnerability in SonicOS allows a remote attacker to crash a firewall.
- How severe is CVE-2026-0400?
- CVE-2026-0400 has a CVSS 3.x base score of 4.9, rated medium severity. It is exploitable over network with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
- Is CVE-2026-0400 being actively exploited?
- It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (34th percentile), an estimate of the probability of exploitation in the next 30 days.
- What products are affected by CVE-2026-0400?
- CVE-2026-0400 affects Sonicwall Sonicos. See the affected-products list for the exact vulnerable versions.
- How do I fix CVE-2026-0400?
- Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
- Does CVE-2026-0400 have an EU (EUVD) identifier?
- Yes. CVE-2026-0400 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8524.
- When was CVE-2026-0400 published?
- CVE-2026-0400 was published on 2026-02-24 and last updated on 2026-06-17.
References
Affected products (1)
- cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*
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Other CWE-134 vulnerabilities
- CVE-2012-1851 — Critical (CVSS 10.0): Format string vulnerability in the Print Spooler service in Microsoft Windows XP SP2 and SP3, Windows Server 2003 SP2,…
- CVE-2012-0242 — Critical (CVSS 10.0): Format string vulnerability in Advantech/BroadWin WebAccess before 7.0 allows remote attackers to execute arbitrary…
- CVE-2011-2475 — Critical (CVSS 10.0): Format string vulnerability in ECTrace.dll in the iMailGateway service in the Internet Mail Gateway in OneBridge Server…
- CVE-2011-1568 — Critical (CVSS 10.0): Format string vulnerability in the logText function in shmemmgr9.dll in IGSSdataServer.exe 9.00.00.11074, and…
- CVE-2010-4235 — Critical (CVSS 10.0): Format string vulnerability in RealNetworks Helix Server 12.x, 13.x, and 14.x before 14.2, and Helix Mobile Server…
- CVE-2011-0270 — Critical (CVSS 10.0): Format string vulnerability in nnmRptConfig.exe in HP OpenView Network Node Manager (OV NNM) 7.51 and 7.53 allows…