How severe is CVE-2009-4495?

CVE-2009-4495 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4495 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4495?

CVE-2009-4495 affects Yaws. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4495?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-4495 published?

CVE-2009-4495 was published on 2010-01-13 and last updated on 2026-06-16.

CVE-2009-4495

CVE-2009-4495 is a medium-severity vulnerability in Yaws with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 9% (95th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Yaws
Published: 2010-01-13
Last modified: 2026-06-16

Description

Yaws 1.85 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.

Frequently asked questions

What is CVE-2009-4495?: Yaws 1.85 writes data to a log file without sanitizing non-printable characters, which might allow remote attackers to modify a window's title, or possibly execute arbitrary commands or overwrite files, via an HTTP request containing an escape sequence for a terminal emulator.
How severe is CVE-2009-4495?: CVE-2009-4495 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4495 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 9% (95th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4495?: CVE-2009-4495 affects Yaws. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4495?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4495 published?: CVE-2009-4495 was published on 2010-01-13 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:yaws:yaws:1.85:*:*:*:*:*:*:*

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