CVE-2021-27435

Exploitation

Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.

SSVC decision

• ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
• AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
• 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

1.85% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 78.8% of scored records. A rank, not a probability.

NVD base score

9.8 (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:H/I:H/A:H

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

2022-05-03 20:22Z4 YR AGO

Last updated

2025-04-16 16:25Z1 YR AGO

Reserved

2021-02-19

Assigning CNA

icscert

Record state

PUBLISHED

Severity

High (CVSS 7.3)

CNA CVSS vector

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

Weaknesses

• CWE-190Integer Overflow or WraparoundBase

Data version

5.1

Document digest

0cc3d48133e58c7cb6eb296e43805a2524cb8fa5e447b432b4f9c2b15273c8d3

• www.cisa.govhttps://www.cisa.gov/uscert/ics/advisories/icsa-21-119-04x_refsource_CONFIRM
• github.comhttps://github.com/ARMmbed/mbed-os/pull/14408x_refsource_CONFIRM