CVE-2025-40905 | WWW::OAuth 1.000 and earlier for Perl uses insecure rand() function for cryptographic functions

WWW::OAuth 1.000 and earlier for Perl uses the rand() function as the default source of entropy, which is not cryptographically secure, for cryptographic functions.

Published: 2026-02-13 Last update: 2026-03-10 Assigner: 9b29abf9-4ab0-4765-b253-1875cd9b441e Source: 9b29abf9-4ab0-4765-b253-1875cd9b441e
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-40905 is rated Low Risk (34.8/100): CVSS High severity, with low exploitation likelihood (EPSS 0.05%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

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-2025-40905

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 2026-02-18 0.02% 0.05% +0.03%
2 2026-02-13 — 0.02% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-40905

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.3 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L 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:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:L)
Might cause slowdowns, glitches, or partial disruption—not a full brick.
 3.9 3.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2025-40905

OS Trackers for CVE-2025-40905

vendor priority summary link
debian not yet assigned CVE-2025-40905 not yet assigned priority: Debian including 1 source packages (libwww-oauth-perl), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2. https://security-tracker.debian.org/tracker/CVE-2025-40905
ubuntu medium CVE-2025-40905 medium priority: Ubuntu including 1 source packages (libwww-oauth-perl), 5 status rows across 5 suites (focal, jammy, noble, questing, upstream): needs-triage 3, not-affected 1, released 1. https://ubuntu.com/security/CVE-2025-40905

Affected software / configurations for CVE-2025-40905

Vendor Product Version Raw CPE
dbook www::oauth <= 1.000 cpe:2.3:a:dbook:www\:\:oauth:*:*:*:*:*:perl:*:*

References for CVE-2025-40905

cvelogic Threat Intelligence