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CVE-2026-77708

5.9 mediumEPSS 0.7%

Medium (5.9) in sonicwall sonicos. EPSS 0.7% estimated probability of exploitation activity in the next 30 days.

A pre-authentication stack-based buffer overflow vulnerability has been identified in the SonicOS TACACS+ authentication client, which in specific conditions could potentially enable a remote unauthenticated attacker to cause an application level denial of service.

Severity

CVSS 3.1

5.9 medium
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
0.7% estimated probability of exploitation activity in the next 30 days; 52nd percentile. Scored 2026-11-10. A forecast for this CVE across the internet, not for your own systems.
CISA's assessment (SSVC)
Exploitation: none · Automatable: no · Technical impact: partial, assessed 2026-11-06. From CISA's Vulnrichment in the CVE List: whether it is exploited, whether exploiting it can be automated, and how much control it gives.
CWE
CWE-121 Stack-based Buffer Overflow
Published
Modified
NVD analysis
Awaiting analysis
Record from
the NVD, synced

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Affected

Versions

From the CNA's record in the CVE List.

ProductAffected
SonicWall SonicOS7.3.3-7015 and older versions
SonicWall SonicOS8.2.2-8015 and older versions

References

Check your stackJSON