CVE-2021-27166

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

19.84% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 97.2% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/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

2021-02-10 18:36Z5 YR AGO

Last updated

2024-08-03 20:40Z2 YR AGO

Reserved

2021-02-10

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

• CWE-798Use of Hard-coded CredentialsBase

Data version

5.1

Document digest

8b514ac0ea52e0ca2822e2aea5d95ad10f8ba5350ecc61c2c1e06856cc82feb2

• pierrekim.github.iohttps://pierrekim.github.io/blog/2021-01-12-fiberhome-ont-0day-vulnerabilities.html#telnet-linux-hardcoded-credentialsx_refsource_MISC