Is CVE-2015-7576 in the CISA KEV catalog?

No. CVE-2015-7576 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-7576?

CVE-2015-7576 has a CVSS v3 base score of 3.7 (LOW).

What is the EPSS score for CVE-2015-7576?

CVE-2015-7576 has an EPSS score of 4.88% (91th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-7576?

Upgrade rails on debian 11 to 2:4.2.5.1-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-7576

LOWEPSS 91th pctl

3.7

CVSS v3

NVD

Description

The http_basic_authenticate_with method in actionpack/lib/action_controller/metal/http_authentication.rb in the Basic Authentication implementation in Action Controller in Ruby on Rails before 3.2.22.1, 4.0.x and 4.1.x before 4.1.14.1, 4.2.x before 4.2.5.1, and 5.x before 5.0.0.beta1.1 does not use a constant-time algorithm for verifying credentials, which makes it easier for remote attackers to bypass authentication by measuring timing differences.

CWE-254

How to fix

Remediation Available

railsDebian

Fixed in:2:4.2.5.1-1CVE-2015-7576

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 ComplexityHigh

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityLow

IntegrityNone

AvailabilityNone

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N

Exploit Intelligence

4.88%probability of exploitation in 30 days

91stpercentile

High risk: more likely to be exploited than 91% of all known CVEs.

References

Other references13

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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 2026-05-06.