How severe is CVE-2025-40905?

CVE-2025-40905 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.

Is CVE-2025-40905 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-40905?

CVE-2025-40905 affects Dbook Www. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-40905?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2025-40905 have an EU (EUVD) identifier?

Yes. CVE-2025-40905 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206911.

When was CVE-2025-40905 published?

CVE-2025-40905 was published on 2026-02-13 and last updated on 2026-06-17.

CVE-2025-40905

CVE-2025-40905 is a high-severity vulnerability in Dbook Www with a CVSS 3.x base score of 7.3. 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-338.

Key facts

Severity: High (CVSS 3.x base score 7.3)
EPSS exploit prediction: 0% (17th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-206911
Weakness: CWE-338
Affected product: Dbook Www
Published: 2026-02-13
Last modified: 2026-06-17

Description

WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

Frequently asked questions

What is CVE-2025-40905?: WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.
How severe is CVE-2025-40905?: CVE-2025-40905 has a CVSS 3.x base score of 7.3, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity low, and availability low.
Is CVE-2025-40905 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (17th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-40905?: CVE-2025-40905 affects Dbook Www. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-40905?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2025-40905 have an EU (EUVD) identifier?: Yes. CVE-2025-40905 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-206911.
When was CVE-2025-40905 published?: CVE-2025-40905 was published on 2026-02-13 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:dbook:www\:\:oauth:*:*:*:*:*:perl:*:*

Other CWE-338 vulnerabilities

CVE-2026-56141 — Critical (CVSS 9.8): In JetBrains Hub before 2026.1.13757, 2025.3.148033, 2025.2.148048, 2025.1.148120, 2024.3.148430, 2024.2.148429 account…
CVE-2026-3256 — Critical (CVSS 9.8): HTTP::Session versions before 0.54 for Perl defaults to using insecurely generated session ids. HTTP::Session defaults…
CVE-2025-15604 — Critical (CVSS 9.8): Amon2 versions before 6.17 for Perl use an insecure random_string implementation for security functions. In versions…
CVE-2025-40926 — Critical (CVSS 9.8): Plack::Middleware::Session::Simple versions before 0.05 for Perl generates session ids insecurely. The default session…
CVE-2026-2439 — Critical (CVSS 9.8): Concierge::Sessions versions from 0.8.1 before 0.8.5 for Perl generate insecure session ids. The generate_session_id…
CVE-2025-15578 — Critical (CVSS 9.8): Maypole versions from 2.10 through 2.13 for Perl generates session ids insecurely. The session id is seeded with the…

Browse all CWE-338 vulnerabilities →