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No exploitation reported

CVE-2020-6959

No exploitation reported by the sources we read.

  • Published2020-01-22
  • WeaknessCWE-502

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

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.

Timeline

dates in UTC
  1. 2020-01-2215:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 18:48 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-2020-6959?format=txt
  • CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-6959?format=csv
  • TAXII collection of exploited CVEs
  • The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD
Honeywell hnmswvms firmwareversion to verify
BranchAffectedFixed in
—≤ vms560no fix published
Honeywell hnmswvmslt firmwareversion to verify
BranchAffectedFixed in
—≤ vms560no fix published
Honeywell maxpro nvr pe firmwareversion to verify
BranchAffectedFixed in
5.6≤ 5.6no fix published

3 more products in the sources.

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

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

  • ICSA-20-021-01 CISA6 known affected

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

    MAXPRO NVR SE: prior to Version NVR 5.6 Build 595 T2-Patch · MAXPRO NVR XE: prior to Version NVR 5.6 Build 595 T2-Patch · HNMSWVMS: prior to Version VMS560 Build 595 T2-Patch · +3 more

Full record on NVD

Fix

  1. Mitigation from the vendor CISA ICSA-20-021-01 · 6 productsHoneywell recommends users update VMS 560 Build 595 T2-Patch for affected VMS systems, and NVR 5.6 Build 595 T2-Patch for affected NVR systems. The updates can be found at the Honeywell's MyWebTech site via a user account. Additionally, Honeywell recommends that users:
  2. Mitigation from the vendor CISA ICSA-20-021-01 · 6 productsUpdate MAXPRO VMS and NVR to latest R560 and 5.6 before applying this patch.
  3. Mitigation from the vendor CISA ICSA-20-021-01 · 6 productsUpdate software patch as recommended in Honeywell security notification (SN 2019-10-25 01).
  4. Mitigation from the vendor CISA ICSA-20-021-01 · 6 productsAs a best practice, Honeywell recommends users isolate their systems from the Internet or create additional layers of defense by placing the affected hardware behind a firewall or into a DMZ; and if remote connections to the network are required, consider using a VPN or other means to ensure secure…

Detection

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

Sources

  • NVDCVSS 3.19.8read 2026-10-23
  • NVDCVSS 2.07.5read 2026-10-23
  • CNAweakness (CWE)CWE-502read 2026-10-23
  • NVDweakness (CWE)CWE-502read 2026-10-23
  • FIRST EPSSEPSS score2.2 %2026-10-22

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
2020-01-22
Last Modified
2026-06-17
NVD status
Modified

Frequently asked questions

What is CVE-2020-6959?

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.

Is CVE-2020-6959 actively exploited?

Active exploitation of CVE-2020-6959 has not been confirmed. Its EPSS score was 2.2% on 2026-10-22, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-6959?

CVE-2020-6959 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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