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.

Published: 2021-03-05 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-25025 is rated Moderate Risk (49.5/100): CVSS Medium severity, with medium exploitation likelihood (EPSS 1.84%). EPSS rose +1.70% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-25025

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.14% 1.84% +1.70%
2 2026-03-03 0.34% 0.14% -0.20%
3 2026-02-16 — 0.34% —

Full EPSS history (13 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-25025

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
5.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 3.9 1.4 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:P/I:N/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:N)
No availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2019-25025

GitHub Security Advisory for CVE-2019-25025

GHSA-cvw2-xj8r-mjf7 · Severity: medium · Ecosystem: rubygems — Activerecord-session_store Vulnerable to Timing Attack

OS Trackers for CVE-2019-25025

vendor priority summary link
redhat medium — https://access.redhat.com/security/cve/CVE-2019-25025
suse medium CVE-2019-25025 severity moderate: SUSE including 138 source package names (ardana-cobbler-8.0+git.1614096566.e8c2b27-3.44.3, ardana-neutron-9.0+git.1615223676.777f0b3-3.25.2, …), 257 product×package rows across 6 product lines (HPE Helion OpenStack 8, SUSE OpenStack Cloud 7, … (6 product lines)): Fixed 257. https://www.suse.com/security/cve/CVE-2019-25025/
ubuntu medium CVE-2019-25025 medium priority: Ubuntu including 1 source packages (ruby-activerecord-session-store), 16 status rows across 16 suites (bionic, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 13, needs-triage 3. https://ubuntu.com/security/CVE-2019-25025

Affected software / configurations for CVE-2019-25025

Vendor Product Version Raw CPE
rubyonrails active_record_session_store <= 1.1.3 cpe:2.3:a:rubyonrails:active_record_session_store:*:*:*:*:*:ruby_on_rails:*:*

References for CVE-2019-25025

cvelogic Threat Intelligence