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CVE-2021-3689

24
FAUCET Score

CVE-2021-3689 describes a predictable algorithm vulnerability in the random number generator of the yiiframework yii2 product. This high-severity vulnerability (CVSS 7.5) allows an unauthenticated attacker to achieve high integrity impact over a network with low attack complexity. Despite its severity, there is no evidence of active exploitation, publicly available exploit code, or significant community discussion or media coverage, suggesting it is not currently a high-profile threat.

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
1.90%
Probability of exploitation in next 30 days
EPSS Percentile
77.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0190 is in the 61st percentile among its peer group of 51,485 CVEs.

Social Chatter

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

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 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-hq3v-rg6f-6hx4high

Use of Insufficiently Random Values in yiisoft/yii2-dev

Sep 1, 2021

References

github.com / yiisoft/yii2/commit/13f27e4d920a05d53236139e8b07007acd046a46
PatchThird Party Advisory
huntr.dev / bounties/50aad1d4-eb00-4573-b8a4-dbe38e2c229f
ExploitThird Party Advisory