CVE-2021-43848

Exploitation

Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.

SSVC decision

• ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
• AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
• Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.

CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.

EPSS probability

2.66% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 85.4% of scored records. A rank, not a probability.

NVD base score

5.9 (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: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

2022-02-01 12:13Z4 YR AGO

Last updated

2025-04-23 19:08Z1 YR AGO

Reserved

2021-11-16

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

High (CVSS 7.4)

CNA CVSS vector

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

Weaknesses

• CWE-908Use of Uninitialized ResourceBase

Data version

5.1

Document digest

7a35c08769f7b35ad1ca18243383ea76f8f73ed91a831e63acfcb5eeb864b9be

• github.comhttps://github.com/h2o/h2o/security/advisories/GHSA-f9xw-j925-m4m4x_refsource_CONFIRM
• github.comhttps://github.com/h2o/h2o/commit/8c0eca3x_refsource_MISC