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CVE-2026-81341— wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records

Quick assessment

Affected
wolfSSL Inc. wolfEngine
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

wolfSSL wolfEngine是wolfSSL公司的一款具备加密运算功能的引擎软件。 wolfSSL wolfEngine 1.4.1之前版本存在加密问题漏洞，该漏洞源于TLS 1.2和DTLS 1.2记录中的显式AES-CCM nonce取自记录输入缓冲区，而非附加认证数据中的TLS序列号，导致同一连接内所有AES-CCM记录使用相同的密钥和nonce对，可能造成信息泄露和认证标签伪造。

CVSS 6.5 · Medium EPSS 0.20% · P10

Affected Version Matrix 1

VendorProduct Version RangeStatus
wolfSSL Inc. wolfEngine ≤ 1.4.0 affected
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I. Basic Information for CVE-2026-81341

Vulnerability Information
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Vulnerability Title
wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records
Source: CVE Program / CVE List V5
Vulnerability Description
wolfEngine 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在加密中重用Nonce与密钥对
Source: CVE Program / CVE List V5
Vulnerability Title
wolfSSL wolfEngine 加密问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
wolfSSL wolfEngine是wolfSSL公司的一款具备加密运算功能的引擎软件。 wolfSSL wolfEngine 1.4.1之前版本存在加密问题漏洞，该漏洞源于TLS 1.2和DTLS 1.2记录中的显式AES-CCM nonce取自记录输入缓冲区，而非附加认证数据中的TLS序列号，导致同一连接内所有AES-CCM记录使用相同的密钥和nonce对，可能造成信息泄露和认证标签伪造。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
wolfSSL Inc. wolfEngine 0 ~ 1.4.0 -

II. Public POCs for CVE-2026-81341

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III. Intelligence Information for CVE-2026-81341

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Vendor Pages for CVE-2026-81341 (1)

Same Patch Batch · wolfSSL Inc. · 2026-08-28 · 3 CVEs total

CVE-2026-81019 7.4 HIGH wolfProvider reuses the AES-GCM nonce on every TLS 1.2 / DTLS 1.2 record
CVE-2026-81020 7.4 HIGH wolfEngine reuses the AES-GCM nonce on every TLS 1.2 / DTLS 1.2 record

IV. Related Vulnerabilities

Same product: wolfEngine
Same vendor: wolfSSL Inc.
Same weakness: CWE-323

V. Comments for CVE-2026-81341

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