CVE-2021-36647

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

0.16% probability of exploitation activity in the next 30 days.

EPSS percentile

Ranks above 6.1% of scored records. A rank, not a probability.

NVD base score

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

NVD CVSS vector

CVSS:3.1/AV:L/AC:H/PR:L/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

2023-01-17 00:00Z3 YR AGO

Last updated

2025-11-03 19:26Z10 MO AGO

Reserved

2021-07-12

Assigning CNA

mitre

Record state

PUBLISHED

Severity

Medium (CVSS 4.7)

CNA CVSS vector

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

Weaknesses

• CWE-327Use of a Broken or Risky Cryptographic AlgorithmClass

Data version

5.2

Document digest

cde5d53b813e3458ea953ead92edf74365e3ee0b8800c96db4b1529cae1ce465

• kouzili.comhttps://kouzili.com/Load-Step.pdf
• github.comhttps://github.com/ARMmbed/mbedtls/releases/
• tls.mbed.orghttps://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-07-1
• lists.debian.orghttps://lists.debian.org/debian-lts-announce/2025/06/msg00034.html