CWE-757
Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used as a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.
CVE-2026-32650 (GCVE-0-2026-32650)
Vulnerability from cvelistv5 – Published: 2026-04-17 19:52 – Updated: 2026-04-17 20:26
VLAI
Title
Anviz CrossChex Standard Algorithm Downgrade
Summary
Anviz CrossChex Standard is vulnerable when an attacker manipulates the TDS7 PreLogin to disable
encryption, causing database credentials to be sent in plaintext and
enabling unauthorized database access.
Severity
7.5 (High)
CWE
Assigner
References
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Anviz | Anviz CrossChex Standard |
Affected:
All versions
|
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CVE-2026-6550 (GCVE-0-2026-6550)
Vulnerability from cvelistv5 – Published: 2026-04-20 19:20 – Updated: 2026-04-20 19:44
VLAI
Title
Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
Summary
Cryptographic algorithm downgrade in the caching layer of Amazon AWS Encryption SDK for Python before version 3.3.1 and before version 4.0.5 might allow an authenticated local threat actor to bypass key commitment policy enforcement via a shared key cache, resulting in ciphertext that can be decrypted to multiple different plaintexts.
To remediate this issue, users should upgrade to version 3.3.1, 4.0.5 or above.
Severity
4.7 (Medium)
CWE
- CWE-757 - Selection of Less-Secure algorithm during negotiation ('algorithm downgrade')
Assigner
References
4 references
| URL | Tags |
|---|---|
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
| https://github.com/aws/aws-encryption-sdk-python/… | patch |
| https://github.com/aws/aws-encryption-sdk-python/… | patch |
| https://github.com/aws/aws-encryption-sdk-python/… | third-party-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | AWS Encryption SDK for Python |
Affected:
2 , ≤ 2.5.1
(custom)
Affected: 3 , ≤ 3.3.0 (custom) Affected: 4 , ≤ 4.0.4 (custom) |
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No mitigation information available for this CWE.
CAPEC-220: Client-Server Protocol Manipulation
An adversary takes advantage of weaknesses in the protocol by which a client and server are communicating to perform unexpected actions. Communication protocols are necessary to transfer messages between client and server applications. Moreover, different protocols may be used for different types of interactions.
CAPEC-606: Weakening of Cellular Encryption
An attacker, with control of a Cellular Rogue Base Station or through cooperation with a Malicious Mobile Network Operator can force the mobile device (e.g., the retransmission device) to use no encryption (A5/0 mode) or to use easily breakable encryption (A5/1 or A5/2 mode).
CAPEC-620: Drop Encryption Level
An attacker forces the encryption level to be lowered, thus enabling a successful attack against the encrypted data.