CVE-2021-3818

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

2.45% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 83.9% of scored records. A rank, not a probability.

NVD base score

5.3 (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:N/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

2021-09-27 12:25Z5 YR AGO

Last updated

2024-08-03 17:09Z2 YR AGO

Reserved

2021-09-20

Assigning CNA

@huntrdev

Record state

PUBLISHED

Severity

Medium (CVSS 6.3)

CNA CVSS vector

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Weaknesses

• CWE-565Reliance on Cookies without Validation and Integrity CheckingBase

Data version

5.1

Document digest

b38b3d7b42e6d86b1b0b3214882f7cf1e74c323c76480273e2c1c1d75d7e3320

• huntr.devhttps://huntr.dev/bounties/c2bc65af-7b93-4020-886e-8cdaeb0a58eax_refsource_CONFIRM
• github.comhttps://github.com/getgrav/grav/commit/c51fb1779b83f620c0b6f3548d4a96322b55df07x_refsource_MISC