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ExploitedIn CISA KEV

CVE-2020-5135

Exploitation confirmed. First attested on 2022-03-15 by CISA-ADP, CISA KEV, GCVE · kevintel.

  • Published2020-10-12
  • WeaknessCWE-120

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.

Timeline

dates in UTC
  1. 2020-10-1211:15CVE publishedNVD
  2. 2022-03-15Added to the CISA KEV catalogCISA KEV
  3. 2022-03-15Listed as exploited by GCVEGCVE
  4. 2022-03-15Exploitation first reportedCISA KEV
  5. 2025-02-0619:55SSVC exploitation set to activeCISA-ADP

Observed activity

isMalicious corpus · updated 2026-11-04 09:37 UTC
Indicators tagged with this CVE, per day0 indicators over 7 days
Block these indicators
  • Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-5135?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-5135?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
SonicWall SonicOS
BranchAffectedFixed in
6.0≤ 6.0.5.3no fix published
6.5≥ 6.5.0.0, ≤ 6.5.1.11no fix published
6.5≥ 6.5.4.0, ≤ 6.5.4.7no fix published
7.0= 7.0.0.0no fix published
Sonicwall sonicosv
BranchAffectedFixed in
6.5≤ 6.5.4.4no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As sonicwall, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • SonicWall SonicOS
    Affected
    • = SonicOS 6.5.4.7-79n and earlierno fix stated
    • = SonicOS 6.5.1.11-4n and earlierno fix stated
    • = SonicOS 6.0.5.3-93o and earlierno fix stated
    • = SonicOSv 6.5.4.4-44v-21-794 and earlierno fix stated
    • = SonicOS 7.0.0.0-1no fix stated

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2020-10-12

Fix

  1. CISA’s required action: Apply updates per vendor instructions.due 2022-04-05

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof-of-concept repositories
none listed
PoC-in-GitHub
Metasploit modules
none listed
Metasploit Framework

CISA Known Exploited Vulnerability

Date Added
2022-03-15
Patch Due Date
2022-04-05
Ransomware Use
Unknown
Required Action
Apply updates per vendor instructions.

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-10-12
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-vw5m-894x-7rp4

Frequently asked questions

What is CVE-2020-5135?

A buffer overflow vulnerability in SonicOS allows a remote attacker to cause Denial of Service (DoS) and potentially execute arbitrary code by sending a malicious request to the firewall. This vulnerability affected SonicOS Gen 6 version 6.5.4.7, 6.5.1.12, 6.0.5.3, SonicOSv 6.5.4.v and Gen 7 version 7.0.0.0.

Is CVE-2020-5135 actively exploited?

Yes. CVE-2020-5135 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2022-04-05.

What is the CVSS score for CVE-2020-5135?

CVE-2020-5135 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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