CVE-2025-0306 | Ruby: openssl: ruby marvin attack

A vulnerability was found in Ruby. The Ruby interpreter is vulnerable to the Marvin Attack. This attack allows the attacker to decrypt previously encrypted messages or forge signatures by exchanging a large number of messages with the vulnerable service.

Published: 2025-01-09 Last update: 2026-04-15 Assigner: [email protected] Source: [email protected]
NVD Status：Deferred，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-0306 is rated Moderate Risk (54.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 0.59%). 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-2025-0306

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 2026-05-31 0.35% 0.59% +0.24%
2 2026-02-17 0.27% 0.35% +0.08%
3 2025-11-21 — 0.27% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-0306

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.4 3.1 HIGH
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/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:H)
Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:N)
Service keeps running; no real outage angle.
 2.2 5.2 [email protected]

Weakness enumeration for CVE-2025-0306

OS Trackers for CVE-2025-0306

vendor priority summary link
debian unimportant CVE-2025-0306 unimportant priority: Debian including 3 source packages (ruby2.7, ruby3.1, ruby3.3), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2025-0306
redhat medium — https://access.redhat.com/security/cve/CVE-2025-0306
suse high CVE-2025-0306 severity important: SUSE including 57 source package names (compat-openssl098, libopenssl-1_0_0-devel, …), 683 product×package rows across 53 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS, … (53 product lines)): Known Not Affected 553, Will Not Fix 130. https://www.suse.com/security/cve/CVE-2025-0306/
ubuntu medium CVE-2025-0306 medium priority: Ubuntu including 6 source packages (ruby2.3, ruby2.5, ruby2.7, ruby3.0, ruby3.2, ruby3.3), 32 status rows across 7 suites (bionic, focal, jammy, noble, oracular, upstream, xenial): DNE 20, needs-triage 6, not-affected 6. https://ubuntu.com/security/CVE-2025-0306

Affected software / configurations for CVE-2025-0306

Vendor Product Version Raw CPE
No affected products in dataset.

References for CVE-2025-0306

cvelogic Threat Intelligence