VYPR

CWE-757

Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')

BaseIncomplete

Description

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.

When a security mechanism can be forced to downgrade to use a less secure algorithm, this can make it easier for attackers to compromise the product by exploiting weaker algorithm. The victim might not be aware that the less secure algorithm is being used. For example, if an attacker can force a communications channel to use cleartext instead of strongly-encrypted data, then the attacker could read the channel by sniffing, instead of going through extra effort of trying to decrypt the data using brute force techniques.

Hierarchy (View 1000)

Parents

Children

none

Related attack patterns (CAPEC)

CAPEC-220 · CAPEC-606 · CAPEC-620

CVEs mapped to this weakness (32)

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  • CVE-2024-4995CriDec 18, 2024
    risk 0.64cvss 9.8epss 0.01

    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.

  • CVE-2025-24154CriJan 27, 2025
    risk 0.59cvss 9.1epss 0.01

    An out-of-bounds write was addressed with improved input validation. This issue is fixed in iOS 18.3 and iPadOS 18.3, macOS Sequoia 15.3, macOS Sonoma 14.7.3, macOS Ventura 13.7.3, visionOS 2.3. An attacker may be able to cause unexpected system termination or corrupt kernel…

  • CVE-2024-38883CriAug 2, 2024
    risk 0.59cvss 9.1epss 0.00

    An issue in Horizon Business Services Inc. Caterease 16.0.1.1663 through 24.0.1.2405 and possibly later versions, allows a remote attacker to perform a Drop Encryption Level attack due to the selection of a less-secure algorithm during negotiation.

  • CVE-2019-14887CriMar 16, 2020
    risk 0.59cvss 9.1epss 0.01

    A flaw was found when an OpenSSL security provider is used with Wildfly, the 'enabled-protocols' value in the Wildfly configuration isn't honored. An attacker could target the traffic sent from Wildfly and downgrade the connection to a weaker version of TLS, potentially breaking…

  • CVE-2026-18691HigAug 11, 2026
    risk 0.57cvss 8.8epss 0.00

    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 cluster's shared…

  • CVE-2024-8773HigMar 24, 2025
    risk 0.54cvss epss 0.00

    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 received a patch…

  • CVE-2018-25029HigFeb 4, 2022
    risk 0.53cvss 8.1epss 0.01

    The Z-Wave specification requires that S2 security can be downgraded to S0 or other less secure protocols, allowing an attacker within radio range during pairing to downgrade and then exploit a different vulnerability (CVE-2013-20003) to intercept and spoof traffic.

  • CVE-2017-9269HigMar 1, 2018
    risk 0.50cvss 7.7epss 0.02

    In libzypp before August 2018 GPG keys attached to YUM repositories were not correctly pinned, allowing malicious repository mirrors to silently downgrade to unsigned repositories with potential malicious content.

  • CVE-2026-32650HigApr 17, 2026
    risk 0.49cvss 7.5epss 0.00

    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.

  • CVE-2025-10693HigOct 31, 2025
    risk 0.49cvss epss 0.00

    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 v2025.6.1.

  • CVE-2022-23000HigJul 25, 2022
    risk 0.47cvss 7.3epss 0.00

    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" or specifying…

  • CVE-2019-16791MedJan 22, 2020
    risk 0.45cvss 6.9epss 0.01

    In postfix-mta-sts-resolver before 0.5.1, All users can receive incorrect response from daemon under rare conditions, rendering downgrade of effective STS policy.

  • CVE-2024-20069MedJun 3, 2024
    risk 0.42cvss 6.5epss 0.01

    In modem, there is a possible selection of less-secure algorithm during the VoWiFi IKE due to a missing DH downgrade check. This could lead to remote information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation. Patch ID:…

  • CVE-2024-23656HigJan 25, 2024
    risk 0.42cvss 7.5epss 0.00

    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 after `TLS cert…

  • CVE-2021-36326MedNov 30, 2021
    risk 0.42cvss 6.5epss 0.01

    Dell EMC Streaming Data Platform, versions prior to 1.3 contain an SSL Strip Vulnerability in the User Interface (UI). A remote unauthenticated attacker could potentially exploit this vulnerability, leading to a downgrade in the communications between the client and server into…

  • CVE-2020-16200MedSep 18, 2020
    risk 0.42cvss 6.5epss 0.01

    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 exhaustion of available …

  • CVE-2017-9267MedMar 2, 2018
    risk 0.42cvss 6.5epss 0.01

    In Novell eDirectory before 9.0.3.1 the LDAP interface was not strictly enforcing cipher restrictions allowing weaker ciphers to be used during SSL BIND operations.

  • CVE-2026-55953HigJul 27, 2026
    risk 0.41cvss 7.4epss 0.00

    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 negotiated protocol version…

  • CVE-2026-4942MedJul 17, 2026
    risk 0.38cvss 5.9epss 0.00

    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.

  • CVE-2026-2673MedMar 13, 2026
    risk 0.35cvss 6.5epss 0.00

    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 even when a more…