MEDIUM
CVE-2021-3692
CWE-1241Published: August 10, 2021· Updated: Jun 17, 2026
5.3
CVSS v3.1
Official Description
yii2 is vulnerable to Use of Predictable Algorithm in Random Number Generator
Technical Analysis
CVE-2021-3692 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityLow
IntegrityNone
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Affected Vendors & Products
yiiframework1 product(s)
yii
Source: NVD CPE · 1 total CPE entries
Exploit & PoC Resources
NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.
Official Patches & Advisories
All References (4)
→
https://github.com/yiisoft/yii2/commit/13f27e4d920a05d53236139e8b07007acd046a46Patch · Third Party Advisory
→
https://huntr.dev/bounties/55517f19-5c28-4db2-8b00-f78f841e8abaExploit · Issue Tracking · Third Party Advisory
→
https://github.com/yiisoft/yii2/commit/13f27e4d920a05d53236139e8b07007acd046a46Patch · Third Party Advisory
→
https://huntr.dev/bounties/55517f19-5c28-4db2-8b00-f78f841e8abaExploit · Issue Tracking · Third Party Advisory
Quick Facts
CVE IDCVE-2021-3692
CVSS Score5.3 / 10
SeverityMEDIUM
WeaknessCWE-1241
CISA KEVNo
Affected1 vendor(s)
PublishedAug 10, 2021
Related CVEs (CWE-1241)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-3692 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWATCH.COM. CVE data is provided under the NVD usage policy.