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CVE record · CVE-2020-5135

Buffer overflow in SonicWall SonicOS

CVSS 9.8 CriticalCriticalIn CISA KEV · ransomwareEPSS 0.27 · 98th percentile

Critical, because:

  • In CISA’s KEV catalogue since 15 Mar 2022: it is known to be exploited.
  • CVSS score 9.8: 9.0 or more.
  • CVSS score 9.8 (7.0 or more) and EPSS 0.27 (0.1 or more): a high score and a real chance of exploitation in the next 30 days.

How we decide what’s critical

Published by the CVE Program (CNA: sonicwall) at 12 Oct 2020, 10:40 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
VendorProductVersions
SonicWall SonicOS
  • affected SonicOS 6.5.4.7-79n and earlier
  • affected SonicOS 6.5.1.11-4n and earlier
  • affected SonicOS 6.0.5.3-93o and earlier
  • affected SonicOSv 6.5.4.4-44v-21-794 and earlier
  • affected SonicOS 7.0.0.0-1
Identifiers
CVE-2020-5135
CNA
sonicwall
Weakness (CWE)
CWE-120
Tags
Published
12 Oct 2020
Updated
21 Oct 2025

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

ScoreRatingCVSSVectorSource
9.8 Critical 3.1 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H ADP (CISA-ADP)
  • CISA KEV Listed since 15 Mar 2022: known to be exploited. CISA reports use in ransomware campaigns.
  • EPSS 0.27, the 98th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 12 Oct 2020. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.