How severe is CVE-2025-27111?

CVE-2025-27111 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2025-27111 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-27111?

CVE-2025-27111 affects Rack. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-27111?

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-2025-27111 have an EU (EUVD) identifier?

Yes. CVE-2025-27111 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6155.

When was CVE-2025-27111 published?

CVE-2025-27111 was published on 2025-03-04 and last updated on 2026-06-17.

CVE-2025-27111

CVE-2025-27111 is a high-severity vulnerability in Rack with a CVSS 3.x base score of 7.5. 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-93.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v4: 6.9
EPSS exploit prediction: 1% (49th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-6155
Weakness: CWE-93
Affected product: Rack
Published: 2025-03-04
Last modified: 2026-06-17

Description

Rack is a modular Ruby web server interface. The Rack::Sendfile middleware logs unsanitised header values from the X-Sendfile-Type header. An attacker can exploit this by injecting escape sequences (such as newline characters) into the header, resulting in log injection. This vulnerability is fixed in 2.2.12, 3.0.13, and 3.1.11.

Frequently asked questions

What is CVE-2025-27111?: Rack is a modular Ruby web server interface. The Rack::Sendfile middleware logs unsanitised header values from the X-Sendfile-Type header. An attacker can exploit this by injecting escape sequences (such as newline characters) into the header, resulting in log injection. This vulnerability is fixed in 2.2.12, 3.0.13, and 3.1.11.
How severe is CVE-2025-27111?: CVE-2025-27111 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2025-27111 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (49th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-27111?: CVE-2025-27111 affects Rack. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-27111?: 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-2025-27111 have an EU (EUVD) identifier?: Yes. CVE-2025-27111 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-6155.
When was CVE-2025-27111 published?: CVE-2025-27111 was published on 2025-03-04 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*

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