CVE-2021-3163

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

1.31% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 68.6% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-04-12 20:35Z5 YR AGO

Last updated

2024-08-03 16:45Z2 YR AGO

Reserved

2021-01-17

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

188d3a43d6b3dd8d6801288c51e1288251bb7b9f5327148bf68acac6e50a700e

• quilljs.comhttps://quilljs.comx_refsource_MISC
• burninatorsec.blogspot.comhttps://burninatorsec.blogspot.com/2021/04/cve-2021-3163-xss-slab-quill-js.htmlx_refsource_MISC
• github.comhttps://github.com/quilljs/quill/issues/3273x_refsource_MISC
• github.comhttps://github.com/quilljs/quill/issues/3364x_refsource_MISC