How severe is CVE-2009-4535?

CVE-2009-4535 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-4535 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-4535?

CVE-2009-4535 affects Valenok Mongoose. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2009-4535?

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

When was CVE-2009-4535 published?

CVE-2009-4535 was published on 2009-12-31 and last updated on 2026-06-16.

CVE-2009-4535

CVE-2009-4535 is a medium-severity vulnerability in Valenok Mongoose 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-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 7% (93rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Valenok Mongoose
Published: 2009-12-31
Last modified: 2026-06-16

Description

Mongoose 2.8.0 and earlier allows remote attackers to obtain the source code for a web page by appending a / (slash) character to the URI.

Frequently asked questions

What is CVE-2009-4535?: Mongoose 2.8.0 and earlier allows remote attackers to obtain the source code for a web page by appending a / (slash) character to the URI.
How severe is CVE-2009-4535?: CVE-2009-4535 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-4535 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 7% (93rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-4535?: CVE-2009-4535 affects Valenok Mongoose. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2009-4535?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-4535 published?: CVE-2009-4535 was published on 2009-12-31 and last updated on 2026-06-16.

References

Affected products (1)

cpe:2.3:a:valenok:mongoose:*:*:*:*:*:*:*:*

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