CVE-2021-3111

EPSS 3.0%

No sign of exploitation. has a public proof of concept.

Vexday Risk Score

23Low

SSVC decision (CISA)

Attend

PoC available → attend closely

Exploit maturity

Proof of concept

Public proof of concept exists, but not yet automated.

CVSS —EPSS 3.0%KEV nãoPoC públicaNuclei —Metasploit —Patch —

Lifecycle

08 Jan 2021Published on NVD

29 Mar 2021Public PoC

Weaponization speed

79 daysto first PoC

Recommendation: Plan a near-term fix — a public PoC already exists.

The Express Entries Dashboard in Concrete5 8.5.4 allows stored XSS via the name field of a new data object at an index.php/dashboard/express/entries/view/ URI.

Affected products

n/a · n/a

public PoCs found — 3

cve_referencepacketstormsecurity.com/files/161600/Concrete5-8.5.4-Cross-Site-Scripting.htmlunverified cve_referencepacketstormsecurity.com/files/161997/Concrete5-8.5.4-Cross-Site-Scripting.htmlunverified exploitdbwww.exploit-db.com/exploits/49721unverified

⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.

References

http://packetstormsecurity.com/files/161600/Concrete5-8.5.4-Cross-Site-Scripting.html http://packetstormsecurity.com/files/161997/Concrete5-8.5.4-Cross-Site-Scripting.html https://documentation.concrete5.org/developers/introduction/version-history https://documentation.concrete5.org/developers/introduction/version-history/855-release-notes https://github.com/Quadron-Research-Lab/CVE/blob/main/CVE-2021-3111.pdf