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CVE-2021-27562

56
FAUCET Score

CVE-2021-27562 is a critical vulnerability in Arm Trusted Firmware-M versions up to 1.2, allowing a non-secure environment to trigger system halts, overwrite secure data, or expose secure information. With a CVSS score of 5.5 (Medium) and a FAUCET Risk Score of 99/100, this local attack requires low privileges but can lead to high availability impacts. Notably, this vulnerability is actively exploited in the wild, as indicated by its presence in the KEV catalog and mentions in multiple security articles detailing its use in Mirai botnet variants targeting IoT devices. Despite active exploitation, no public exploit code is currently available on platforms like Metasploit or ExploitDB.

Impacted Technologies

VendorProductVersion(s)CPE
<= 1.2.0CPE matchmatch criteria
cpe:2.3:o:trustedfirmware:trusted_firmware-m:*:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

5.5MEDIUM

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

Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
1.8
Impact Score
3.6
CvssVersion
3.1

Exploit Intelligence

EPSS Score
3.09%
Probability of exploitation in next 30 days
EPSS Percentile
86.4%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
Added to KEV · Nov 3, 2021
This CVE's current EPSS score of 0.0309 is in the 99th percentile among its peer group of 15,938 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
developer.arm.com / support/arm-security-updates
Vendor Advisory
git.trustedfirmware.org / TF-M/trusted-firmware-m.git/tree/docs/security/security_advisories/svc_caller_sp_fetching_vulnerability.rst
Permissions RequiredThird Party Advisory