CASCACascade Atlas

Evidence dossier

CVE-2020-5135

CVE-2020-5135

69.1–89.9Priority evidence range
As known Jul 19, 2026, 5:00 AM UTCgen-56ccdaf9

Normalized restatement

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.

State
PUBLISHED
Published
Oct 12, 2020
Updated
Oct 21, 2025
Evidence coverage
72%
CISA KEVCatalog member

Apply updates per vendor instructions.

FIRST EPSS26.87%

2026-07-18 · v2026.06.15 · percentile 97.8%

Source stateConflict visible

Distinct CVSS assessments remain side by side; none are averaged.

Source comparison

Who said what

CISA-ADPindependent enrichment
container

CISA ADP Vulnrichment

CVEderivative copy
container

CVE Program Container

sonicwalloriginal assertion
container

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.

CISA KEVoriginal assertion
observed_exploitation

SonicWall SonicOS Buffer Overflow Vulnerability

FIRST EPSSoriginal assertion
model_probability

Probability 0.268690000000; percentile 0.978140000000

Applicability

Cited product scope

Trace impact →
SonicWallSonicOS
[{"status": "affected", "version": "SonicOS 6.5.4.7-79n and earlier"}, {"status": "affected", "version": "SonicOS 6.5.1.11-4n and earlier"}, {"status": "affected", "version": "SonicOS 6.0.5.3-93o and earlier"}, {"status": "affected", "version": "SonicOSv 6.5.4.4-44v-21-794 and earlier"}, {"status": "affected", "version": "SonicOS 7.0.0.0-1"}]unknown
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*; end including 6.0.5.3supported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*; start including 6.5.0.0; end including 6.5.1.11supported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sonicos:*:*:*:*:*:*:*:*; start including 6.5.4.0; end including 6.5.4.7supported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sonicos:7.0.0.0:*:*:*:*:*:*:*supported
Unknown vendorUnknown product
cpe:2.3:o:sonicwall:sonicosv:*:*:*:*:*:*:*:*; end including 6.5.4.4supported

Assessments

CVSS by origin

9.8
nvd@nist.govCVSS 3.1 · role PrimaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
7.5
nvd@nist.govCVSS 2.0 · role PrimaryAV:N/AC:L/Au:N/C:P/I:P/A:P
9.8
134c704f-9b21-4f2e-91b3-4a467353bcc0CVSS 3.1 · role SecondaryCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8
CISA-ADPCVSS 3.1 · role unknownCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Limitations and unknowns

  • KEV membership is authoritative for the catalog, not proof of exposure in any environment.
  • EPSS is a dated model probability and not an individual-environment prediction.
  • Affected or fixed status applies only to the exact cited product and version scope; unresolved scope remains unknown.
  • NVD-carried upstream facts remain derivative and are not independent corroboration.
  • Only NVD metrics validated under the generation-bound calculator are Public Priority eligible; direct CVE record metrics remain display-only.
  • NVD CVSS source eligibility is closed: NVD-authored, exact record-source, or registered same-CVE container origin; unmapped sources remain display-only.
  • Factor D is unknown in Public Core because no accepted canonical mapping-obligation ledger is present.
  • Core replay supports the active and immediately prior generation; retrospective valid-at replay is deferred.