CVE-2021-26560

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

0.75% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 52.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-02-26 21:45Z5 YR AGO

Last updated

2024-09-17 01:30Z1 YR AGO

Reserved

2021-02-02

Assigning CNA

synology

Record state

PUBLISHED

Severity

Critical (CVSS 9.0)

CNA CVSS vector

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

Weaknesses

• CWE-319Cleartext Transmission of Sensitive InformationBase

Data version

5.1

Document digest

fc925305526cc8ebdb0ef88eacda05838e66b1a48a1dfd08c7b12cf454e31d4e

• www.synology.comhttps://www.synology.com/security/advisory/Synology_SA_20_26x_refsource_CONFIRM
• www.talosintelligence.comhttps://www.talosintelligence.com/vulnerability_reports/TALOS-2020-1159x_refsource_MISC