Is CVE-2009-0255 in the CISA KEV catalog?

No. CVE-2009-0255 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2009-0255?

CVE-2009-0255 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2009-0255?

CVE-2009-0255 has an EPSS score of 9.44% (95th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2009-0255?

Upgrade typo3 to 4.2.4 or later.

CVE & CISA-KEV Catalog

CVE-2009-0255

HIGHEPSS 95th pctl

7.5

CVSS v3

NVD

Description

The System extension Install tool in TYPO3 4.0.0 through 4.0.9, 4.1.0 through 4.1.7, and 4.2.0 through 4.2.3 creates the encryption key with an insufficiently random seed, which makes it easier for attackers to crack the key.

CWE-330

How to fix

Remediation Available

typo3NVD

Affected:>= 4.2.0, < 4.2.4Fixed in:4.2.4CVE-2009-0255derived 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

ConfidentialityHigh

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

9.44%probability of exploitation in 30 days

95thpercentile

High risk: more likely to be exploited than 95% of all known CVEs.

References

Vendor Advisory3

Third-Party Advisory2

Mailing List1

debian.org

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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 2026-04-23.