CVE-2021-27738

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

2.56% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 83.7% of scored records. A rank, not a probability.

NVD base score

7.5 (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: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

2022-01-06 12:35Z4 YR AGO

Last updated

2024-08-03 21:26Z2 YR AGO

Reserved

2021-02-26

Assigning CNA

apache

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

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

Data version

5.1

Document digest

879cb8f25d0b45e2473161ffadadcdaa21bd66cab8319da83e34ede9d8be6251

• lists.apache.orghttps://lists.apache.org/thread/vkohh0to2vzwymyb2x13fszs3cs3vd70x_refsource_MISC
• www.openwall.com[oss-security] 20220106 CVE-2021-27738: Apache Kylin: Improper Access Control to Streaming Coordinator & SSRFhttp://www.openwall.com/lists/oss-security/2022/01/06/6mailing-listx_refsource_MLIST