CVE-2021-42071

CRITICALNVD 9.89.8—Elevated

9.8

In Visual Tools DVR VX16 4.2.28.0, an unauthenticated attacker can achieve remote command execution via shell metacharacters in the cgi-bin/slogin/login.py User-Agent HTTP header.

CVSS v3: 9.8
EG Score: 9.8(high)
EPSS: 99.7%
KEV: Not listed

Published

October 7, 2021

Last Modified

November 21, 2024

References (6)

cve@mitrehttps://visual-tools.com/
cve@mitrehttps://www.exploit-db.com/exploits/50098
cve@mitrehttps://www.swascan.com/security-advisory-visual-tools-dvr-cve-2021-42071/
af854a3a-2127-422b-91ae-364da2661108https://visual-tools.com/
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/50098
af854a3a-2127-422b-91ae-364da2661108https://www.swascan.com/security-advisory-visual-tools-dvr-cve-2021-42071/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-78OS Command Injection

Data Freshness Timeline

(refreshed 3× in last 7d / 10× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-05 22:45 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-31 00:15 UTCepss_batch
2026-05-29 13:42 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-28 13:43 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 13:42 UTCepss_batch
2026-05-26 09:20 UTCEG score recompute
2026-05-26 09:20 UTCGHSA enrichment

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-50098
First seen Jul 6, 2021
Visual Tools DVR VX16 4.2.28.0 - OS Command Injection (Unauthenticated)
Open source ↗
Nucleihttp/cves/2021/CVE-2021-42071.yaml
First seen Jan 1, 2021
Visual Tools DVR VX16 4.2.28.0 - Unauthenticated OS Command Injection
Open source ↗

Frequently asked(5)

What is CVE-2021-42071?

CVE-2021-42071 is a critical vulnerability published on October 7, 2021. In Visual Tools DVR VX16 4.2.28.0, an unauthenticated attacker can achieve remote command execution via shell metacharacters in the cgi-bin/slogin/login.py User-Agent HTTP header.

When was CVE-2021-42071 disclosed?

CVE-2021-42071 was first published in the National Vulnerability Database on October 7, 2021, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2021-42071 actively exploited?

CVE-2021-42071 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 99.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2021-42071?

CVE-2021-42071 has a CVSS v3 base score of 9.8 (NVD).

How do I remediate CVE-2021-42071?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2021-42071, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

See which npm, PyPI, Go, and Maven packages are affected by CVE-2021-42071

Explore →

Is Your Infrastructure Affected by CVE-2021-42071?

EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.

Start Free Scan →Browse All CVEs

CVE-2021-42071

📅 Published

🔄 Last Modified

🔗 References (6)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2021-42071?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (6)

Frequently asked(5)

Related CVEs(same CWE)