Threat Intelligence / CVE / CVE-2017-7921

CVE-2017-7921 — Hikvision Ds-2dfx Series Firmware

CISA KEV
CVSS v3.1 9.8 (CRITICAL) · EPSS 94.2% (higher than 99.9% of all scored CVEs) · Priority 9/10 · Published 2017-05-06

As of 2026-03-05, CVE-2017-7921 is a CRITICAL-severity vulnerability in Hikvision Ds-2dfx Series Firmware, CVSS v3.1 9.8, EPSS 94.2% (99.9th percentile). It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-03-05), with a US federal remediation deadline of 2026-03-26. Threadlinqs Intelligence links 3 tracked threat campaigns to CVE-2017-7921, most recently “Seedworm (MuddyWater) Iranian MOIS APT Deploys Dindoor and Fakeset Backdoors Against U.S. Bank, Airport, and Defense Software Company”.

Last updated: 2026-03-05

What is CVE-2017-7921?

An Improper Authentication issue was discovered in Hikvision DS-2CD2xx2F-I Series V5.2.0 build 140721 to V5.4.0 build 160530, DS-2CD2xx0F-I Series V5.2.0 build 140721 to V5.4.0 Build 160401, DS-2CD2xx2FWD Series V5.3.1 build 150410 to V5.4.4 Build 161125, DS-2CD4x2xFWD Series V5.2.0 build 140721 to V5.4.0 Build 160414, DS-2CD4xx5 Series V5.2.0 build 140721 to V5.4.0 Build 160421, DS-2DFx Series V5.2.0 build 140805 to V5.4.5 Build 160928, and DS-2CD63xx Series V5.0.9 build 140305 to V5.3.5 Build 160106 devices. The improper authentication vulnerability occurs when an application does not adequately or correctly authenticate users. This may allow a malicious user to escalate his or her privileges on the system and gain access to sensitive information.

The record classifies CVE-2017-7921 under weakness class CWE-287. Its CVSS v3 base vector states that the flaw is reachable remotely over the network, needs no prior authentication, needs no user interaction, and has high impact on confidentiality, integrity, availability. 116 affected-product entries are recorded, across 1 vendor, listed below. The identifier was first published 3417 days ago.

Severity and exploitation probability

CVSS v3.1 base score
9.8 — CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS (FIRST)
94.2% probability of exploitation in the next 30 days, higher than 99.9% of all scored CVEs
CISA KEV
Listed since 2026-03-05, federal remediation deadline 2026-03-26
Threadlinqs priority
9/10 — CISA KEV-listed, which Threadlinqs floors at 9
Published
2017-05-06, last modified 2026-03-05

Is CVE-2017-7921 being exploited?

CISA added CVE-2017-7921 to the Known Exploited Vulnerabilities catalog on 2026-03-05, which means the agency holds evidence of exploitation in the wild; US federal civilian agencies had to remediate it by 2026-03-26 under BOD 22-01. It currently carries a trending score of 40 in the Threadlinqs vulnerability feed.

Affected products and versions

Showing 25 of 116 recorded product entries.

How to fix CVE-2017-7921

The record marks a vendor fix as available for CVE-2017-7921. Patch reference: https://www.hikvision.com/en/support/cybersecurity/security-advisory/improper-authentication-in-certain-hikvision-products/. Vendor advisory: http://www.hikvision.com/us/about_10805.html. Because CVE-2017-7921 is KEV-listed, US federal civilian agencies were required to apply the vendor fix, or stop using the product, by 2026-03-26. Apply the vendor fix referenced above to every affected product listed in this record, then confirm the running version against the vendor advisory.

Threat activity tracking CVE-2017-7921

3 tracked threats in the Threadlinqs corpus reference CVE-2017-7921, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Seeded from nvd and not yet processed by the Threadlinqs enrichment pipeline, so blank CVSS, EPSS or KEV fields above mean NOT MEASURED rather than measured-absent.

Full detection coverage & IOCs for threats exploiting CVE-2017-7921 are available via the Threadlinqs MCP server (Purple tier). View plans →

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