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CVE-2026-81020— wolfEngine reuses the AES-GCM nonce on every TLS 1.2 / DTLS 1.2 record

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，该漏洞源于生成8字节显式AES-GCM nonce时未递增，导致密钥和nonce重用，可能泄露密钥流和GHASH认证密钥，从而伪造认证标签。

CVSS 7.4 · High EPSS 0.24% · P15

Possible ATT&CK Techniques 1 AI

T1557 · Adversary-in-the-Middle

Affected Version Matrix 1

VendorProduct Version RangeStatus
wolfSSL Inc. wolfEngine ≤ 1.4.0 affected
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I. Basic Information for CVE-2026-81020

Vulnerability Information
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Vulnerability Title
wolfEngine reuses the AES-GCM nonce on every TLS 1.2 / DTLS 1.2 record
Source: CVE Program / CVE List V5
Vulnerability Description
wolfEngine before 1.4.1 generates the 8-byte explicit AES-GCM nonce once when the TLS write key is set and never increments it per record. As a result every TLS 1.2 and DTLS 1.2 AES-GCM record within a connection is encrypted under an identical key and nonce pair. Reusing a GCM key and nonce discloses the keystream (the XOR of two ciphertexts equals the XOR of their plaintexts, so one known record recovers the others) and leaks the GHASH authentication key, enabling authentication tag forgery. AES-CCM, 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:H/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，该漏洞源于生成8字节显式AES-GCM nonce时未递增，导致密钥和nonce重用，可能泄露密钥流和GHASH认证密钥，从而伪造认证标签。
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-2026-81020

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III. Intelligence Information for CVE-2026-81020

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Vendor Pages for CVE-2026-81020 (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-2026-81341 6.5 MEDIUM wolfEngine reuses the AES-CCM nonce on TLS 1.2 / DTLS 1.2 records

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-81020

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