What is the CVSS score of CVE-2017-7921?

CVE-2017-7921 has a CVSS 3.1 base score of 9.8 (Critical). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H. EPSS exploitation probability: 94.2%.

Is there a public PoC exploit available for CVE-2017-7921?

Yes, a public proof-of-concept exploit is available for CVE-2017-7921. Prioritise patching immediately. EPSS: 94.2%.

Is there a patch available for CVE-2017-7921?

Yes, a patch is available for CVE-2017-7921. Update the affected software to the latest version immediately.

Hikvision CVE-2017-7921

CRITICAL

Improper Authentication (CWE-287)

2017-05-06 ics-cert@hq.dhs.gov

Authentication Bypass Hikvision

9.8

CVSS 3.1 · NVD

View

Vulnerability Assessment

Weakness	CWE CWE-287 OWASP Top 10:2025 A07:2025 - Authentication Failures ASVS 5.0 V6 - Authentication Authentication mechanism validation MITRE ATT&CK 2 techniques across 2 tactics: Defense Evasion, Initial Access The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Impact	CVSS score of 9.8 (CRITICAL). Attack characteristics: network attack vector, low complexity, no privileges required, no user interaction not required. CISA has confirmed active exploitation in the wild. Public proof-of-concept exploit code is available. EPSS exploitation probability: 94.23%.
Exploit ScenarioDerived	A remote attacker could bypass authentication mechanisms to gain unauthorized access by sending crafted requests to the affected application. No authentication is required to exploit this vulnerability.

Act Now Prioritize within 24-48h. Why: In CISA KEV with patch available.

Exploited in the wild (CISA KEV) Patch available 94.2% exploitation probability (EPSS)

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AnalysisAI

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,. Rated critical severity (CVSS 9.8), this vulnerability is remotely exploitable, no authentication required, low attack complexity. Actively exploited in the wild (cisa kev) and public exploit code available.

RemediationAI

A vendor patch is available. Apply the latest security update as soon as possible. Implement multi-factor authentication, enforce strong password policies, use proven authentication frameworks.

Affects your stack

Find out whether the stacks and servers you run are on an affected version.

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

This vulnerability is classified as Improper Authentication (CWE-287), which allows attackers to bypass authentication mechanisms to gain unauthorized access. 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 include: Hikvision Ds-2Cd2032-I Firmware, Hikvision Ds-2Cd2112-I Firmware, Hikvision Ds-2Cd2132-I Firmware, Hikvision Ds-2Cd2212-I5 Firmware, Hikvision Ds-2Cd2232-I5 Firmware.

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 9.8 CRITICAL

AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

High

Lifecycle Timeline

Added to CISA KEV

Apr 21, 2026 - 15:31 CISA

CVE Published

May 06, 2017 - 00:29 cve.org

CRITICAL 9.8

DescriptionCVE.org

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.

Threat Intelligence Overview

Threat Score

7.8/10

Composite threat intelligence

EPSS Score

94.2%

Top 0% exploitable

Exploit

POC

Public exploit code exists

Data Quality

4 sources

Confidence: Medium

NVD

CVE.org

CISA KEV

EPSS POC (3)

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity CRITICAL

CISA KEV Yes

Public POC Yes

EPSS 94.2%

Patch available Yes

Active threat Yes

Deciding rule

In CISA KEV with patch available

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived

Immediate

Exploitation· derived

Active

System Exposure· derived

Open

Automatable· derived

Yes

Human Impact· derived

High

Priority Score

213

Low Medium High Critical

KEV: +50

EPSS: +94

CVSS: +49

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Authentication Bypass CRITICAL

Authentication bypass attacks exploit flaws in the verification mechanisms that control access to systems and applications.

Affected Products (CPE)CVE.org

cpe:2.3:o:hikvision:ds-2cd2032-i_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2112-i_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2132-i_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2212-i5_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2232-i5_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2312-i_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2332-i_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2412f-i\(w\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2432f-i\(w\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2512f-i\(s\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2532f-i\(s\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2612f-i\(s\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2632f-i\(s\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2712f-i\(s\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2732f-i\(s\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2t32-i3_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2t32-i5_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd2t32-i8_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd4012f-\(a\)_firmware:-:*:*:*:*:*:*:*

cpe:2.3:o:hikvision:ds-2cd4012f-\(p\)_firmware:-:*:*:*:*:*:*:*

+ 38 more

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Same weakness CWE-287 – Improper Authentication

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8.2

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CVE-2015-1187 CRITICAL POC

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9.3

References

Advisories & patches

PATCH http://www.hikvision.com/us/about_10805.html REF http://www.securityfocus.com/bid/98313 REF https://ghostbin.com/paste/q2vq2 REF https://ics-cert.us-cert.gov/advisories/ICSA-17-124-01 REF https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2017-7921 REF https://www.hikvision.com/cn/support/CybersecurityCenter/SecurityNotices/20170314/ REF https://www.hikvision.com/en/support/cybersecurity/security-advisory/security-notification--privilege-escalating-vulnerability-in-cer/ REF https://www.hikvision.com/us-en/support/document-center/special-notices/privilege-escalating-vulnerability-in-certain-hikvision-ip-cameras/

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