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CVE-2025-27498— AEADs/ascon-aead: Plaintext exposed in decrypt_in_place_detached even on tag verification failure

Quick assessment

Affected
RustCrypto AEADs
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.

aes-gcm是aes-gcm开源的一种加密算法。 aes-gcm 0.4.3之前版本存在数据伪造问题漏洞，该漏洞源于解密时即使标签不正确，仍会暴露解密后的密文。

AI Predicted 5.3 Difficulty: Easy EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1560.001 · Archive via Utility
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I. Basic Information for CVE-2025-27498

Vulnerability Information
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Vulnerability Title
AEADs/ascon-aead: Plaintext exposed in decrypt_in_place_detached even on tag verification failure
Source: CVE Program / CVE List V5
Vulnerability Description
aes-gcm is a pure Rust implementation of the AES-GCM. In decrypt_in_place_detached, the decrypted ciphertext (which is the correct ciphertext) is exposed even if the tag is incorrect. This is because in decrypt_inplace in asconcore.rs, tag verification causes an error to be returned with the plaintext contents still in buffer. The vulnerability is fixed in 0.4.3.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:H/AT:N/PR:N/UI:A/VC:L/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
密码学签名的验证不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
aes-gcm 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
aes-gcm是aes-gcm开源的一种加密算法。 aes-gcm 0.4.3之前版本存在数据伪造问题漏洞，该漏洞源于解密时即使标签不正确，仍会暴露解密后的密文。
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
RustCrypto AEADs < 0.4.3 -

II. Public POCs for CVE-2025-27498

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III. Intelligence Information for CVE-2025-27498

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Patches & Fixes for CVE-2025-27498 (1)

Vendor Advisories for CVE-2025-27498 (1)

IV. Related Vulnerabilities

Same product: AEADs
Same vendor: RustCrypto
Same weakness: CWE-347

V. Comments for CVE-2025-27498

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