Weakness (CWE)
CWE-757: Algorithm Downgrade
A protocol or its implementation supports interaction between multiple actors and allows those actors to negotiate which algorithm should be used in a protection mechanism such as encryption or authentication, but it does not select the strongest algorithm that is available to both parties.
Source: MITRE CWE-757
45 results · Feed
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Low 3.7
rustls before 0.23.46 Key Exchange Downgrade via Unauthenticated ServerHello
rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X2…
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Medium 5.3
In Modem, there is a possible information disclosure due to side channel information disclosure. This could lead to rem…
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Low 3.7
rustls: An unauthenticated ServerHello poisons the per-name key-exchange record, so later ClientHellos carry only a classical X25519 share
## Summary The client records the server-selected key-exchange group per server name when it processes the ServerHello, before the server is authenticated. A network attacker can answer one connection attempt for a target name with a ServerHello that selects …
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Medium 5.3
RSA PKCS#1 v1.5 padding oracle via legacy envelope key format downgrade in Amazon S3 Encryption Client for .NET
A remote user who can read encrypted objects in the S3 bucket can force a padding downgrade by altering the padding scheme recorded in an object's metadata to legacy PKCS#1 v1.5. Since this padding scheme is susceptible to the well-known Bleichenbacher attack…
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Medium 5.3
FreeRDP 3.0.0 before 3.32.0 Security Protocol Downgrade via Negotiation Response
The FreeRDP client 3.0.0 before 3.32.0 does not check a server-selected PROTOCOL_RDSTLS or PROTOCOL_HYBRID_EX against its enabled protocol set in nego_process_negotiation_response(), allowing a security protocol downgrade. A malicious server or man-in-the-mid…
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High 8.8
AsyncHttpClient: Digest mutual authentication is switched off by a peer offering qop=auth-int
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. In 3.0.12, a peer offering only Digest qop=auth-int causes mutual-authentication verification to be skipped. AuthenticatorUti…
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High 8.7
AsyncHttpClient: Digest challenge without a usable nonce downgrades to Basic and sends the password in cleartext
The AsyncHttpClient (AHC) library allows Java applications to easily execute HTTP requests and asynchronously process HTTP responses. Prior to 3.0.13 and 2.16.1, Realm.Builder treats a Digest challenge that yields no usable nonce as a Basic challenge. A malic…
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Critical 9.2
Apache PLC4X: OPC UA secure channel: integrity bypass, unverifiable server certificate, and silent downgrade
Improper Verification of Cryptographic Signature and Improper Certificate Validation in the OPC UA driver of Apache PLC4X (PLC4J) allows an attacker in a network position between client and server to impersonate the OPC UA server and to read, forge or modify …
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High 8.8
Howyar｜WeenyGenius - Use of Insecure Protocol
WeenyGenius, a computer lab management system by Howyar Technologies, has a Use of Insecure Protocol vulnerability. Due to the reliance on ZMTP Null mode, unauthenticated attackers on the same network can capture packets to leak transmitted data, or perform r…
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Medium 6.6
SMB minimum protocol dialect defaults to SMB1
Unless the application explicitly raises smbMinVersion, the jCIFS client will negotiate down to SMB1/CIFS, which lacks mandatory signing/encryption and is vulnerable to NTLM relay and content-tampering MITM. Spring Integration 7.1.0 Spring Integration 7.0.0 -…
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Critical 9.8
Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify
Net::OAuth versions before 0.33 for Perl allow the sender to choose the signature algorithm in verify. verify resolves the signature method class from the signature_method parameter of the incoming message. signature_method is required on every request, so th…
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Critical 9.8
Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token
Net::OAuth::Client versions before 0.32 for Perl allow the service provider to silently downgrade OAuth 1.0a to OAuth 1.0 in get_request_token. Passing a callback to the constructor selects OAuth 1.0a. get_request_token then revokes that choice when the reque…
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High 8.8
Improper Authentication in MongoDB Intra-Cluster Connections Allows Credential Exposure
An issue in MongoDB Server's intra-cluster connection setup could allow a party with suitable network access to influence which authentication mechanism is used when one replica set member connects to another. Under certain conditions, this could cause the cl…
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High 8.7
better-auth before 1.6.11 Insecure Cryptographic Defaults via oidcProvider
better-auth versions before 1.6.11 contain insecure cryptographic defaults in the oidcProvider and mcp plugins that advertise the none algorithm and accept plain PKCE by default. Attackers can exploit algorithm negotiation to accept unsigned tokens or interce…
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Critical 9.1
TLS 1.2 and DTLS client accepts unoffered anonymous cipher suite, bypassing server authentication
The Erlang/OTP ssl TLS 1.2 (and earlier) and DTLS client does not verify that the cipher suite selected by the server in ServerHello was among the suites offered by the client in ClientHello. The client-side tls_handshake:hello/5 handler validates the negotia…
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Medium 5.9
IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
IBM i 7.6, 7.5, 7.4, and 7.3 could allow a remote attacker to send a specifically crafted message and downgrade the Transport Layer Security (TLS) protocol to a version disabled in the server configuration.
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High 8.2
SCRAM: Silent channel-binding authentication downgrade via unsupported certificate algorithms
SCRAM (Salted Challenge Response Authentication Mechanism) is part of the family of Simple Authentication and Security Layer (SASL, RFC 4422) authentication mechanisms. Prior to 3.3, a flaw in com.ongres.scram:scram-client and com.ongres.scram:scram-common al…
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Medium 6.3
Symfony: Mailomat Mailer Webhook Parser Reads the HMAC Algorithm from the Request: Signature Algorithm Downgrade
Symfony is a PHP framework for web and console applications and a set of reusable PHP components. Prior to 7.4.13 and 8.0.13, MailomatRequestParser::validateSignature() parsed X-MOM-Webhook-Signature as algo=signature and passed the request-selected algorithm…
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Low 3.7
CoreWCF: WS-Security Reference DigestMethod Algorithm-Suite Bypass
CoreWCF is a port of the service side of Windows Communication Foundation (WCF) to .NET Core. Prior to 1.8.1 and 1.9.1, the CoreWCF WS-Security 1.0 receive pipeline validates ds:SignedInfo SignatureMethod against the configured SecurityAlgorithmSuite but does…
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High 8.2
Silent channel-binding authentication downgrade via unsupported certificate algorithms
pgjdbc is an open source postgresql JDBC Driver. In releases 42.7.4 through 42.7.11, channelBinding=require connections can be silently downgraded from SCRAM-SHA-256-PLUS with channel binding to plain SCRAM-SHA-256 without it, losing the man-in-the-middle pro…
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Low 2.1
Encrypt-then-MAC could fall back to MAC-then-Encrypt when HAVE_ENCRYPT_THEN_MAC is configured
When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encrypt rather than enforcing Encrypt-then-MAC.
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Medium 5.3
net: TLS 1.2 connections allowed on TLS 1.3 sockets
Zephyr sockets created with `IPPROTO_TLS_1_3` can still negotiate a TLS 1.2 connection when both TLS versions are enabled in Kconfig, because the socket-level protocol selection is not propagated to mbedTLS (e.g. via `mbedtls_ssl_conf_min_tls_version`). The C…
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Medium 4.7
Key commitment policy bypass via shared key cache in AWS Encryption SDK for Python
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, re…
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High 7.5
Anviz CrossChex Standard Algorithm Downgrade
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.
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Medium 6.5
OpenSSL TLS 1.3 server may choose unexpected key agreement group
Issue summary: An OpenSSL TLS 1.3 server may fail to negotiate the expected preferred key exchange group when its key exchange group configuration includes the default by using the 'DEFAULT' keyword. Impact summary: A less preferred key exchange may be used e…
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High 7.6
Silicon Labs Z-Wave PIR Sensor Joins Network as Non-Secure
When SmartStart Inclusion fails during the onboarding of a Z-Wave PIR sensor, the sensor will join the network as a non-secure device. This vulnerability exists in Silicon Labs' Z-Wave PIR Sensor Reference design delivered as part of SiSDK v2025.6.0 and v2025…
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Low 3.1
psPAS does not enforce TLS 1.2 within Get-PASSAMLResponse
psPAS PowerShell module does not explicitly enforce TLS 1.2 within the 'Get-PASSAMLResponse' function during the SAML authentication process. An unauthenticated attacker in a 'Man-in-the-Middle' position could manipulate the TLS handshake and downgrade TLS to…
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Medium 4.8
Dell NetWorker, versions 19.12.0.1 and prior, contains a Selection of Less-Secure Algorithm During Negotiation ('Algori…
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High 8.3
Protocol Downgrade in SIMPLE.ERP
SIMPLE.ERP client is vulnerable to MS SQL protocol downgrade request from a server side, what could lead to an unencrypted communication vulnerable to data interception and modification. This issue affect SIMPLE.ERP from 6.20 to 6.30. Only the 6.30 version re…
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Critical 9.1
An out-of-bounds write was addressed with improved input validation. This issue is fixed in iOS 18.3 and iPadOS 18.3, m…
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Critical 9.1
Protocol Downgrade in Wapro ERP Desktop
Wapro ERP Desktop is vulnerable to MS SQL protocol downgrade request from a server side, what could lead to an unencrypted communication vulnerable to data interception and modification. This issue affects Wapro ERP Desktop versions before 9.00.0.
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Critical 9.1
An issue in Horizon Business Services Inc. Caterease 16.0.1.1663 through 24.0.1.2405 and possibly later versions, allow…
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Medium 6.5
In modem, there is a possible selection of less-secure algorithm during the VoWiFi IKE due to a missing DH downgrade ch…
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High 7.5
Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers
Dex is an identity service that uses OpenID Connect to drive authentication for other apps. Dex 2.37.0 serves HTTPS with insecure TLS 1.0 and TLS 1.1. `cmd/dex/serve.go` line 425 seemingly sets TLS 1.2 as minimum version, but the whole `tlsConfig` is ignored …
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Low 3.7
IBM Security Directory Suite information disclosure
IBM Security Directory Suite 8.0.1 uses weaker than expected cryptographic algorithms that could allow an attacker to decrypt highly sensitive information. IBM X-Force ID: 228568.
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Medium 6.5
Quarkus-core: tls protocol configured with quarkus.http.ssl.protocols is not enforced, client can enforce weaker supported tls protocol
A vulnerability was found in quarkus-core. This vulnerability occurs because the TLS protocol configured with quarkus.http.ssl.protocols is not enforced, and the client can force the selection of the weaker supported TLS protocol.
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High 7.3
Weak Default SSL use in Port Forwarding Service
The Western Digital My Cloud Web App [https://os5.mycloud.com/] uses a weak SSLContext when attempting to configure port forwarding rules. This was enabled to maintain compatibility with old or outdated home routers. By using an "SSL" context instead of "TLS"…
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Unscored —
The Z-Wave specification requires that S2 security can be downgraded to S0 or other less secure protocols, allowing an …
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Medium 6.5
Dell EMC Streaming Data Platform, versions prior to 1.3 contain an SSL Strip Vulnerability in the User Interface (UI). …
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Medium 6.5
Philips Clinical Collaboration Platform Algorithm Downgrade
Philips Clinical Collaboration Platform, Versions 12.2.1 and prior, does not properly control the allocation and maintenance of a limited resource, thereby enabling an attacker to influence the amount of resources consumed, eventually leading to the exhaustio…