Background exploitation KEV catalog No authentication

CVE-2017-7921

Hikvision Multiple Products Improper Authentication Vulnerability

CheckOps priority index

9.3/10 Patch within 24 h

Severity9.8

Probability10.0

Exploitation4/5

Severity = CVSS. Probability = EPSS (FIRST). Exploitation = public signals: KEV, EUVD, ransomware, EPSS above 10 %, no account required.

EPSS · today 100.00% higher than 99.99% of CVEs

CVSS 3.1 9.8 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:

Exploited for 243 days 05 Mar 2026

CISA due date 26 Mar 2026 for US federal agencies

Exploitation probability EPSS · FIRST

EPSS probability (%)Percentile among all CVEs

Exploitation signals 4 / 5

KEV catalog (CISA)05 Mar 2026
Exploited in EUVD (ENISA)05 Mar 2026
Used by ransomwareno
EPSS above 10 %100.00%
No account, over the networkyes

What to do

Fix

Apply the vendor’s fix as soon as it is available.

CISA guidance: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Meanwhile

Take the service off the internet or restrict access to it, watch the logs and look for signs of compromise.

Manufacturers (CRA)

Exploited vulnerability in your product: early warning to ENISA within 24 h, then notification within 72 h (Article 14 of the Cyber Resilience Act). The CRA explained

Description ENISA EUVD

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.

Affected products

Hikvision CamerasMultiple Products

Affected versions

Hikvision Cameras

Weaknesses (CWE)

CWE-287

Open source packages OSV

Affected libraries according to OSV, with fixed versions.

Timeline

06 May 2017
Published
05 Mar 2026
Exploitation reported (ENISA)
05 Mar 2026
Added to the KEV catalog
26 Mar 2026
CISA remediation due date
26 Sept 2026
EPSS peak: 100.00%

References

Other exploited vulnerabilities from the same vendor

CVE-2021-36260Hikvision Improper Input Validation
9.3 · Background exploitation