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Fencer Vulns
critical 9.8

CVE-2020-6959 json

The following versions of MAXPRO VMS and NVR, MAXPRO VMS:HNMSWVMS prior to Version VMS560 Build 595 T2-Patch, HNMSWVMSLT prior to Version V…

published 2020-01-22 6 y ago modified 2026-06-17 4 mo ago also EUVD-2020-28099

cvss
9.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.2%
EPSS 2.2% chance of exploitation in 30 days, percentile 82%
public exploits
0
none known

Summary

The following versions of MAXPRO VMS and NVR, MAXPRO VMS:HNMSWVMS prior to Version VMS560 Build 595 T2-Patch, HNMSWVMSLT prior to Version VMS560 Build 595 T2-Patch, MAXPRO NVR: MAXPRO NVR XE prior to Version NVR 5.6 Build 595 T2-Patch, MAXPRO NVR SE prior to Version NVR 5.6 Build 595 T2-Patch, MAXPRO NVR PE prior to Version NVR 5.6 Build 595 T2-Patch, and MPNVRSWXX prior to Version NVR 5.6 Build 595 T2-Patch are vulnerable to an unsafe deserialization of untrusted data. An attacker may be able to remotely modify deserialized data without authentication using a specially crafted web request, resulting in remote code execution.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-20-021-01 updated cvss 9.8

ICSA-20-021-01_Honeywell Maxpro VMS & NVR

  • Honeywell HNMSWVMS < VMS560 Build 595 T2-Patch Honeywell HNMSWVMSLT < VMS560 Build 595 T2-Patch Honeywell MAXPRO NVR PE < NVR 5.6 Build 595 T2-Patch Honeywell MAXPRO NVR SE < NVR 5.6 Build 595 T2-Patch Honeywell MAXPRO NVR XE < NVR 5.6 Build 595 T2-Patch Honeywell MPNVRSWXX < NVR 5.6 Build 595 T2-Patch
    affected: mitigation “Update MAXPRO VMS and NVR to latest R560 and 5.6 before applying this patch.” mywebtech.honeywell.com

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

2.21% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by version score vector
NVD 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD 2.0 7.5 AV:N/AC:L/Au:N/C:P/I:P/A:P

Affected products

  • n/a Honeywell Maxpro VMS & NVR

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.