CVE & CISA-KEV Catalog

CVE-2021-33540

HIGH
7.3
CVSS v3
NVD

Description

In certain devices of the Phoenix Contact AXL F BK and IL BK product families an undocumented password protected FTP access to the root directory exists.

CWE-798Hard-coded Credentials

How to fix

Remediation Available
axl f bk eip ef firmwareNVD
Affected:< 1.30Fixed in:1.30CVE-2021-33540derived from NVD
axl f bk eip firmwareNVD
Affected:< 1.30Fixed in:1.30CVE-2021-33540derived from NVD
axl f bk eth firmwareNVD
Affected:< 1.30Fixed in:1.30CVE-2021-33540derived from NVD
axl f bk eth xc firmwareNVD
Affected:< 1.30Fixed in:1.30CVE-2021-33540derived from NVD
axl f bk pn tps firmwareNVD
Affected:< 1.30Fixed in:1.30CVE-2021-33540derived from NVD
axl f bk pn tps xc firmwareNVD
Affected:< 1.30Fixed in:1.30CVE-2021-33540derived from NVD
axl f bk s35 firmwareNVD
Affected:< 1.40Fixed in:1.40CVE-2021-33540derived from NVD

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged

Impact

ConfidentialityLow
IntegrityLow
AvailabilityLow

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

Exploit Intelligence

0.72%probability of exploitation in 30 days
50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Third-Party Advisory1

Related Vulnerabilities

Other CWE-798 (Hard-coded Credentials) vulnerabilities, ordered by exploit likelihood. View all

CVESeverityCVSSEPSSExploitedFix
CVE-2022-26138Critical9.898%KEV-
CVE-2024-3272Critical9.898%KEV-
CVE-2025-30406Critical9.094%KEVFix
CVE-2024-28987Critical9.193%KEVFix
CVE-2019-15976Critical9.893%-Fix
CVE-2024-20439Critical9.892%KEVFix
Embed a live status badge for CVE-2021-33540
CVE-2021-33540 severity badge

Markdown

[![CVE-2021-33540](https://tridentstack.com/cve/badge/CVE-2021-33540.svg)](https://tridentstack.com/cve/CVE-2021-33540)

HTML

<a href="https://tridentstack.com/cve/CVE-2021-33540"><img src="https://tridentstack.com/cve/badge/CVE-2021-33540.svg" alt="CVE-2021-33540"></a>

Find and fix vulnerabilities across your fleet

TridentStack Control continuously scans your Windows, macOS, and Linux fleet for known vulnerabilities, prioritizes them by severity and active exploitation, and patches them automatically.

Start free

This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2024-11-21.