How severe is CVE-2021-36260?

CVE-2021-36260 has a CVSS score of 9.8/10, rated CRITICAL. Immediate patching is strongly recommended.

Which packages are affected by CVE-2021-36260?

Affected package information for CVE-2021-36260 is not yet fully mapped. Check the official advisory links for details.

How do I fix CVE-2021-36260?

No fixed version has been published for CVE-2021-36260 yet. Monitor the advisory for updates, apply mitigations recommended by the vendor, and use O3 Security to track when a fix becomes available in your stack.

Is CVE-2021-36260 actively exploited in the wild?

Yes. There are 22 known exploit references for CVE-2021-36260, including 1 documented proof-of-concept exploit on Exploit-DB and 13 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-2021-36260?

CVE-2021-36260 has an EPSS (Exploit Prediction Scoring System) score of 94.4%, 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-2021-36260 in the CISA Known Exploited Vulnerabilities catalog?

Yes. CVE-2021-36260 (Hikvision Improper Input Validation) was added to CISA's Known Exploited Vulnerabilities (KEV) catalog on 2022-01-10. CISA required all US federal civilian agencies to remediate this vulnerability by 2022-01-24. The required action was: Apply updates per vendor instructions. 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-2021-36260?

CVE-2021-36260 is classified as OS Command Injection (CWE-78). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation. This is a high-impact weakness class that often enables remote code execution or data exposure.

Which products and versions are affected by CVE-2021-36260?

CVE-2021-36260 affects hikvision ds-2cd2021g1-i\(w\) firmware; hikvision ds-2cd2023g2-i\(u\) firmware; hikvision ds-2cd2026g2-iu\/sl firmware; hikvision ds-2cd2027g2-l\(u\) firmware, and 252 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-2021-36260?

A Nuclei detection template exists for CVE-2021-36260, meaning automated scanners can fingerprint it. 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-2021-36260 published, and has it been updated?

CVE-2021-36260 was published on September 22, 2021 and was last updated on November 10, 2025. 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 2022-01-10 — agencies required to remediate by 2022-01-24

CVE-2021-36260

CRITICAL

A command injection vulnerability in the web server of some Hikvision product. Due to the insufficient input validation, attacker can exploit the vulnerability to launch a command injection…

Published

Sep 22, 2021

Updated

Nov 10, 2025

Affected

0 pkgs

Patched

None yet

Exploits

22 known

EPSS Exploitation Probability

via FIRST.org ↗

94.4%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

A command injection vulnerability in the web server of some Hikvision product. Due to the insufficient input validation, attacker can exploit the vulnerability to launch a command injection attack by sending some messages with malicious commands.

Affected Products

256 products · 305 configurations

ds-2cd2021g1-i\(w\) firmwarehikvision

all

ds-2cd2023g2-i\(u\) firmwarehikvision

all

ds-2cd2026g2-iu\/sl firmwarehikvision

all

ds-2cd2027g2-l\(u\) firmwarehikvision

all

ds-2cd2027g2-lu\/sl firmwarehikvision

all

ds-2cd2043g2-i\(u\) 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.

EDB-50441webappshardware

Hikvision Web Server Build 210702 - Command Injection

by bashis · Oct 25, 2021

Exploit-DB Source

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-36260 in your stack?

O3 detects CVE-2021-36260 across dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my stack How O3 SCA works

CVSS Score

9.8/10

CVSS v3 base score

Vector breakdown

AV:Attack Vector

Network

AC:Attack Complexity

Low

PR:Privileges Required

None

UI:User Interaction

None

S:Scope

Unchanged

C:Confidentiality

High

I:Integrity

High

A:Availability

High

Raw vector

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

CWE Classification

CWE-78OS Command Injection

Weaponization

Timeline

Disclosed

Sep 22, 2021

First exploit

Oct 25, 2021

KEV added

Jan 10, 2022

Last updated

Nov 10, 2025

Identifiers

CVE-2021-36260

References

Advisorytherecord.media Advisoryhikvision.com Advisorytherecord.media Advisoryhikvision.com Exploit / PoCpacketstormsecurity.com Exploit / PoCpacketstormsecurity.com Exploit / PoCcyfirma.com Exploit / PoCpacketstormsecurity.com Exploit / PoCpacketstormsecurity.com Exploit / PoCcyfirma.com Webcisa.gov

Data from OSV.dev, enriched by O3 Security. Refreshed hourly.