How severe is CVE-2019-25025?

CVE-2019-25025 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2019-25025 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-25025?

CVE-2019-25025 affects Rubyonrails Active Record Session Store. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2019-25025?

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

When was CVE-2019-25025 published?

CVE-2019-25025 was published on 2021-03-05 and last updated on 2026-06-17.

CVE-2019-25025

CVE-2019-25025 is a medium-severity vulnerability in Rubyonrails Active Record Session Store with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
CVSS v2: 5.0
EPSS exploit prediction: 2% (76th percentile)
Actively exploited: Not listed in CISA KEV
Affected product: Rubyonrails Active Record Session Store
Published: 2021-03-05
Last modified: 2026-06-17

Description

The activerecord-session_store (aka Active Record Session Store) component through 1.1.3 for Ruby on Rails does not use a constant-time approach when delivering information about whether a guessed session ID is valid. Consequently, remote attackers can leverage timing discrepancies to achieve a correct guess in a relatively short amount of time. This is a related issue to CVE-2019-16782.

Frequently asked questions

What is CVE-2019-25025?: The activerecord-session_store (aka Active Record Session Store) component through 1.1.3 for Ruby on Rails does not use a constant-time approach when delivering information about whether a guessed session ID is valid. Consequently, remote attackers can leverage timing discrepancies to achieve a correct guess in a relatively short amount of time. This is a related issue to CVE-2019-16782.
How severe is CVE-2019-25025?: CVE-2019-25025 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2019-25025 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (76th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-25025?: CVE-2019-25025 affects Rubyonrails Active Record Session Store. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2019-25025?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2019-25025 published?: CVE-2019-25025 was published on 2021-03-05 and last updated on 2026-06-17.

References

https://github.com/rails/activerecord-session_store/pull/151

Affected products (1)

cpe:2.3:a:rubyonrails:active_record_session_store:*:*:*:*:*:ruby_on_rails:*:*