CVE-2021-3111

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

3.01% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 86.2% of scored records. A rank, not a probability.

NVD base score

4.8 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2021-01-08 14:18Z5 YR AGO

Last updated

2024-08-03 16:45Z2 YR AGO

Reserved

2021-01-07

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

5c51f2466a7418a5a369dfb9f50be03d2c7f36de7ade505aacc256654e32e481

• documentation.concrete5.orghttps://documentation.concrete5.org/developers/introduction/version-historyx_refsource_MISC
• github.comhttps://github.com/Quadron-Research-Lab/CVE/blob/main/CVE-2021-3111.pdfx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/161600/Concrete5-8.5.4-Cross-Site-Scripting.htmlx_refsource_MISC
• documentation.concrete5.orghttps://documentation.concrete5.org/developers/introduction/version-history/855-release-notesx_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/161997/Concrete5-8.5.4-Cross-Site-Scripting.htmlx_refsource_MISC