wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-81341
StatePUBLISHED
AssignerwolfSSL
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-28 16:18:29 UTC
Updated2026-09-01 20:56:59 UTC
DescriptionwolfEngine before 1.4.1 sources the explicit AES-CCM nonce for TLS 1.2 and DTLS 1.2 records from the record input buffer instead of the TLS sequence number carried in the additional authenticated data. Because the record layer leaves the explicit-nonce field for the cipher to populate, the value read is constant across records, so every AES-CCM record within a connection is encrypted under an identical key and nonce pair. Reusing a CCM key and nonce weakens confidentiality (identical keystream across records, so a known record recovers the others) and integrity (authentication tag forgery). Only wolfEngine is affected; wolfProvider is not. AES-GCM under wolfEngine is tracked separately. AES-CCM cipher suites are not enabled by default and must be explicitly selected, which limits exposure. TLS 1.3 and non-TLS use of the cipher are not affected.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.002020000 probability, percentile 0.100830000 (date 2026-09-02)

Problem Types: CWE-323 | CWE-323 CWE-323 Reusing a Nonce, Key Pair in Encryption

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
3.1CNACVSS6.5MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
Low
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA WolfSSL Inc. WolfEngine affected 1.4.0 git Not specified

References

ReferenceSourceLinkTags
www.wolfssl.com/docs/security-vulnerabilities [email protected] www.wolfssl.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: wolfSSL security team (en)

Additional Advisory Data

Solutions

CNA: Upgrade to wolfEngine 1.4.1, which sources the explicit AES-CCM nonce from the TLS sequence number. As an interim mitigation do not enable AES-CCM cipher suites, or use TLS 1.3.

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