CVE-2021-20877

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

0.84% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 55.3% 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

2022-02-08 10:30Z4 YR AGO

Last updated

2024-08-03 17:53Z2 YR AGO

Reserved

2020-12-17

Assigning CNA

jpcert

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

cdfd262e6122932bca8a391f164b102ed6272298d776b57994bc5a03e9438c75

• cweb.canon.jphttps://cweb.canon.jp/e-support/info/211221xss.htmlx_refsource_MISC
• www.usa.canon.comhttps://www.usa.canon.com/internet/portal/us/home/support/product-advisories/detail/Service-Notice-Canon-Laser-Printer-and-Small-Office-Multifunctional-Printer-related-to-cross-site-scriptingx_refsource_MISC
• www.canon-europe.comhttps://www.canon-europe.com/support/product-security-latest-news/x_refsource_MISC
• jvn.jphttps://jvn.jp/en/jp/JVN64806328/index.htmlx_refsource_MISC
• jvn.jphttps://jvn.jp/jp/JVN64806328/index.htmlx_refsource_MISC