Is CVE-2021-21002 in the CISA KEV catalog?

No. CVE-2021-21002 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2021-21002?

CVE-2021-21002 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2021-21002?

CVE-2021-21002 has an EPSS score of 0.96% (57th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2021-21002?

Upgrade fl comserver uni 232\/422\/485-t firmware to 2.40 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2021-21002

HIGH

7.5

CVSS v3

NVD

Description

In Phoenix Contact FL COMSERVER UNI in versions < 2.40 a invalid Modbus exception response can lead to a temporary denial of service.

CWE-772

How to fix

Remediation Available

fl comserver uni 232\/422\/485-t firmwareNVD

Affected:< 2.40Fixed in:2.40CVE-2021-21002derived from NVD

fl comserver uni 232\/422\/485 firmwareNVD

Affected:< 2.40Fixed in:2.40CVE-2021-21002derived 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

ConfidentialityNone

IntegrityNone

AvailabilityHigh

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

Exploit Intelligence

0.96%probability of exploitation in 30 days

57thpercentile

Moderate risk: more likely to be exploited than 57% of all known CVEs.

References

Third-Party Advisory1

cert.vde.com

Related Vulnerabilities

Other CWE-772 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2003-0132	Medium	5.0	87%	-	Fix
CVE-2017-14495	High	7.5	84%	-	Fix
CVE-2021-22883	High	7.5	77%	-	Fix
CVE-2024-2398	High	8.6	36%	-	Fix
CVE-2020-9375	High	7.5	28%	-	-
CVE-1999-1127	High	7.5	18%	-	-

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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.