CVE-2021-33181

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

0.97% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 59.4% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

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

2021-06-01 09:50Z5 YR AGO

Last updated

2024-09-17 03:34Z1 YR AGO

Reserved

2021-05-18

Assigning CNA

synology

Record state

PUBLISHED

Severity

Medium (CVSS 6.6)

CNA CVSS vector

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

Weaknesses

• CWE-918Server-Side Request Forgery (SSRF)Base

Data version

5.1

Document digest

add0e8e7a9b17960d9a1de9d9cb3c9b9d0eebe066f48f5e14fdb6eae4f2d4cae

• www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_21_04x_refsource_CONFIRM