How severe is CVE-2017-7921?

CVE-2017-7921 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which products are affected by CVE-2017-7921?

Affected package information for CVE-2017-7921 is not yet fully mapped. Check the official advisory links for details.

How do I patch CVE-2017-7921?

No patch has shipped for CVE-2017-7921 yet — track the hikvision ds-2cd2t32-i3 firmware advisory for a fixed release and apply the workarounds below in the meantime.

How do I detect CVE-2017-7921 across my infrastructure?

Inventory every hikvision ds-2cd2t32-i3 firmware deployment and check each version against the affected-products list above. Because the exploit targets the running system rather than your application code, also watch for exploitation at the network and runtime layer — O3 flags the exploit behaviour from runtime telemetry and egress traffic even before a vulnerable build is confirmed.

How do I mitigate CVE-2017-7921 if there is no patch (or I can't update yet)?

Cut exposure now: restrict the management/admin interface to trusted networks, segment the device, and apply the vendor's recommended configuration mitigations and any WAF/IPS signature. O3's runtime protection blocks the exploit chain at execution, holding the line on unpatched or end-of-life systems until you can patch.

How does O3 Security protect against CVE-2017-7921?

O3 detects and blocks CVE-2017-7921 exploitation at runtime: eBPF exploit-chain detection, plus L7 egress monitoring that catches the post-exploitation callback and severs the attacker's outbound channel.

Is CVE-2017-7921 actively exploited in the wild?

Yes. There are 20 known exploit references for CVE-2017-7921, including 10 in-the-wild exploitations observed on GitHub and other sources. Treat this as actively exploitable and prioritize patching immediately. All exploit code should only be run in an isolated sandbox environment for research or authorized testing — never against production systems without explicit written authorization.

What is the EPSS score for CVE-2017-7921?

CVE-2017-7921 has an EPSS (Exploit Prediction Scoring System) score of 100.0%, placing it in the 100th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. A score above 50% indicates significantly elevated exploitation risk — immediate patching is strongly recommended.

Is CVE-2017-7921 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2017-7921 (Hikvision Multiple Products Improper Authentication Vulnerability) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2026-03-05. CISA required all US federal civilian agencies to remediate this vulnerability by 2026-03-26. The required action was: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. Being listed in the KEV catalog is the strongest possible confirmation of active exploitation — treat this as a critical priority.

What type of vulnerability is CVE-2017-7921?

CVE-2017-7921 is classified as Improper Authentication (CWE-287). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

Which products and versions are affected by CVE-2017-7921?

CVE-2017-7921 affects hikvision ds-2cd2t32-i3 firmware; hikvision ds-2cd2t32-i5 firmware; hikvision ds-2cd2t32-i8 firmware; hikvision ds-2cd63xx series firmware, and 54 more product(s). Check the affected-products list on this page against your deployed version to confirm exposure.

Is there exploit tooling available for CVE-2017-7921?

A Nuclei detection template exists for CVE-2017-7921, meaning automated scanners can fingerprint it. 2 Metasploit modules reference CVE-2017-7921, which lowers the barrier to weaponization. Public exploit tooling significantly increases real-world risk — prioritize patching and ensure detection coverage. Exploit tooling should only ever be used in isolated, authorized testing environments.

When was CVE-2017-7921 published, and has it been updated?

CVE-2017-7921 was published on May 6, 2017 and was last updated on June 17, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CISA KEV·Added 2026-03-05 — agencies required to remediate by 2026-03-26

CVE-2017-7921

CRITICAL

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…

Published

May 6, 2017

Updated

Jun 17, 2026

Affected

0 pkgs

Patched

None yet

Exploits

20 known

EPSS Exploitation Probability

via FIRST.org ↗

100.0%probability of exploitation in next 30 days

Very High Risk100th percentile0.00%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Description

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

58 products · 58 configurations

ds-2cd2t32-i3 firmwarehikvision

all

ds-2cd2t32-i5 firmwarehikvision

all

ds-2cd2t32-i8 firmwarehikvision

all

ds-2cd63xx series firmwarehikvision

all

ds-2cd2032-i firmwarehikvision

all

ds-2cd2112-i firmwarehikvision

all

Exploits & PoCs

Research use only. For defensive security, authorized penetration testing, and academic research only. Never execute exploit code against systems without explicit written authorization.