CVE-2021-21266

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

1.10% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 63.3% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

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

2021-02-01 14:40Z5 YR AGO

Last updated

2024-08-03 18:09Z2 YR AGO

Reserved

2020-12-22

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.4)

CNA CVSS vector

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

Weaknesses

• CWE-611Improper Restriction of XML External Entity ReferenceBase

Data version

5.1

Document digest

7dfcabd4c7384ed469c5deed53514cc664298b310ea4e8d3560e2edc4e1f57d7

• github.comhttps://github.com/openhab/openhab-addons/security/advisories/GHSA-r2hc-pmr7-4c9rx_refsource_CONFIRM
• dev.tohttps://dev.to/brianverm/configure-your-java-xml-parsers-to-prevent-xxe-213cx_refsource_MISC
• www.contrastsecurity.comhttps://www.contrastsecurity.com/security-influencers/xml-xxe-pitfalls-with-jaxbx_refsource_MISC
• github.comhttps://github.com/openhab/openhab-addons/commit/81935b0ab126e6d9aebd2f6c3fc67d82bb7e8b86x_refsource_MISC