CVE-2021-3355

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

7.25% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 93.8% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/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

2021-02-24 15:00Z5 YR AGO

Last updated

2024-08-03 16:53Z2 YR AGO

Reserved

2021-02-01

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

de916584b2a0ef5b1ffaa8f9fc4a10d1fda48058877365cce008e0fb6fc42501

• github.comhttps://github.com/eddy8/LightCMS/issues/18x_refsource_MISC
• packetstormsecurity.comhttp://packetstormsecurity.com/files/161562/LightCMS-1.3.4-Cross-Site-Scripting.htmlx_refsource_MISC
• gist.github.comhttps://gist.github.com/Peithon/1c628ded0c4fc96c6331c3cce1d0c69bx_refsource_MISC
• www.exploit-db.comhttps://www.exploit-db.com/exploits/49598x_refsource_MISC