HIGH
CVE-2021-37156
CWE-613Published: August 5, 2021· Updated: Jun 17, 2026
7.5
CVSS v3.1
Official Description
Redmine 4.2.0 and 4.2.1 allow existing user sessions to continue upon enabling two-factor authentication for the user's account, but the intended behavior is for those sessions to be terminated.
Technical Analysis
CVE-2021-37156 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.
A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 7.5.
CVSS v3.1 Vector Breakdown
Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.None
User InteractionNone
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityHigh
AvailabilityNone
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Affected Vendors & Products
redmine1 product(s)
redmine
Source: NVD CPE · 2 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://www.redmine.org/news/132Release Notes · Vendor Advisory
→
https://www.redmine.org/news/132Release Notes · Vendor Advisory
Quick Facts
CVE IDCVE-2021-37156
CVSS Score7.5 / 10
SeverityHIGH
WeaknessCWE-613
CISA KEVNo
Affected1 vendor(s)
PublishedAug 5, 2021
Related CVEs (CWE-613)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2021-37156 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. CVE data is provided under the NVD usage policy.