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CVE-2021-29415

19
FAUCET Score

CVE-2021-29415 describes a non-constant time ECDSA implementation within the ARM TrustZone CryptoCell 310 hardware accelerator in Nordic Semiconductor nRF52840 devices. This vulnerability allows a local attacker to recover the private ECC key used during an ECDSA operation, posing a high confidentiality risk. The CVSS score is 5.5 (Medium) due to the local attack vector and low attack complexity. There is no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.

Impacted Technologies

VendorProductVersion(s)CPE
<= 2021-03-29CPE matchmatch criteria
cpe:2.3:o:nordicsemi:nrf52840_firmware:*:*:*:*:*:*:*:*

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:H/I:N/A:N

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

Exploit Intelligence

EPSS Score
0.27%
Probability of exploitation in next 30 days
EPSS Percentile
19.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0027 is in the 75th percentile among its peer group of 15,940 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

No media coverage found for this CVE.

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

eprint.iacr.org / 2021/640
Third Party Advisory
aisec.fraunhofer.de / de/das-institut/wissenschaftliche-exzellenz/security-and-trust-in-open-source-security-tokens.html
Third Party Advisory
sit.fraunhofer.de / en/news-events/downloads-services/cve
Not Applicable