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CVE-2021-3692

19
FAUCET Score

CVE-2021-3692 describes a medium-severity vulnerability in yiiframework yii, specifically a "Use of Predictable Algorithm in Random Number Generator" (CWE-330, CWE-1241). This flaw, with a CVSS score of 5.3, allows an unauthenticated attacker to remotely compromise confidentiality with low impact due to the predictable nature of generated random numbers. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage, indicating a low current threat landscape.

Impacted Technologies

VendorProductVersion(s)CPE
>= 2.0.0, < 2.0.43CPE matchmatch criteria
cpe:2.3:a:yiiframework:yii:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

8.1HIGH

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.2
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
1.70%
Probability of exploitation in next 30 days
EPSS Percentile
74.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
This CVE's current EPSS score of 0.0170 is in the 60th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

composerpatch availablevia ghsa
Product: yiisoft/yii2-devFixed in: 2.0.43
github_advisorypatch availablevia nvd_reference
View patch

Vendor Advisories (1)

composerGHSA-wwvv-x5mq-h3jjmedium

Use of Cryptographically Weak Pseudo-Random Number Generator in yiisoft/yii2-dev

Sep 1, 2021

References

github.com / yiisoft/yii2/commit/13f27e4d920a05d53236139e8b07007acd046a46
PatchThird Party Advisory
huntr.dev / bounties/55517f19-5c28-4db2-8b00-f78f841e8aba
ExploitIssue TrackingThird Party Advisory