Common Weakness Enumeration
CWE-757
AllowedSelection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Abstraction: Base · Status: Incomplete
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.
58 vulnerabilities reference this CWE, most recent first.
CVE-2026-6092 (GCVE-0-2026-6092)
Vulnerability from cvelistv5 – Published: 2026-06-25 21:06 – Updated: 2026-06-26 10:25
VLAI
EPSS
VEX
Title
Encrypt-then-MAC could fall back to MAC-then-Encrypt when HAVE_ENCRYPT_THEN_MAC is configured
Summary
When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encrypt rather than enforcing Encrypt-then-MAC.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-26 10:24 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
2 references
Impacted products
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CVE-2026-4942 (GCVE-0-2026-4942)
Vulnerability from cvelistv5 – Published: 2026-07-17 19:32 – Updated: 2026-07-20 13:52
VLAI
EPSS
VEX
Title
IBM i is Affected by Algorithm Downgrade in Transport Layer Security []
Summary
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.
Severity
5.9 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-07-20 13:52 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7278992 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | i |
Affected:
7.6
Affected: 7.5 Affected: 7.4 Affected: 7.3 cpe:2.3:a:ibm:i:7.6:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.6.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.5:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.5.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.4:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.4.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.3:*:*:*:*:*:*:* cpe:2.3:a:ibm:i:7.3.0:*:*:*:*:*:*:* |
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CVE-2026-2673 (GCVE-0-2026-2673)
Vulnerability from cvelistv5 – Published: 2026-03-13 13:23 – Updated: 2026-05-18 19:23
VLAI
EPSS
VEX
Title
OpenSSL TLS 1.3 server may choose unexpected key agreement group
Summary
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
preferred group is supported by both client and server, if the group
was not included among the client's initial predicated keyshares.
This will sometimes be the case with the new hybrid post-quantum groups,
if the client chooses to defer their use until specifically requested by
the server.
If an OpenSSL TLS 1.3 server's configuration uses the 'DEFAULT' keyword to
interpolate the built-in default group list into its own configuration, perhaps
adding or removing specific elements, then an implementation defect causes the
'DEFAULT' list to lose its 'tuple' structure, and all server-supported groups
were treated as a single sufficiently secure 'tuple', with the server not
sending a Hello Retry Request (HRR) even when a group in a more preferred tuple
was mutually supported.
As a result, the client and server might fail to negotiate a mutually supported
post-quantum key agreement group, such as 'X25519MLKEM768', if the client's
configuration results in only 'classical' groups (such as 'X25519' being the
only ones in the client's initial keyshare prediction).
OpenSSL 3.5 and later support a new syntax for selecting the most preferred TLS
1.3 key agreement group on TLS servers. The old syntax had a single 'flat'
list of groups, and treated all the supported groups as sufficiently secure.
If any of the keyshares predicted by the client were supported by the server
the most preferred among these was selected, even if other groups supported by
the client, but not included in the list of predicted keyshares would have been
more preferred, if included.
The new syntax partitions the groups into distinct 'tuples' of roughly
equivalent security. Within each tuple the most preferred group included among
the client's predicted keyshares is chosen, but if the client supports a group
from a more preferred tuple, but did not predict any corresponding keyshares,
the server will ask the client to retry the ClientHello (by issuing a Hello
Retry Request or HRR) with the most preferred mutually supported group.
The above works as expected when the server's configuration uses the built-in
default group list, or explicitly defines its own list by directly defining the
various desired groups and group 'tuples'.
No OpenSSL FIPS modules are affected by this issue, the code in question lies
outside the FIPS boundary.
OpenSSL 3.6 and 3.5 are vulnerable to this issue.
OpenSSL 3.6 users should upgrade to OpenSSL 3.6.2 once it is released.
OpenSSL 3.5 users should upgrade to OpenSSL 3.5.6 once it is released.
OpenSSL 3.4, 3.3, 3.0, 1.0.2 and 1.1.1 are not affected by this issue.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-17 17:17 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
5 references
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| OpenSSL | OpenSSL |
Affected:
3.6.0 , < 3.6.2
(semver)
Affected: 3.5.0 , < 3.5.6 (semver) |
|
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
Date Public
2026-03-13 14:00
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CVE-2026-1677 (GCVE-0-2026-1677)
Vulnerability from cvelistv5 – Published: 2026-05-11 05:52 – Updated: 2026-05-11 16:31
VLAI
EPSS
VEX
Title
net: TLS 1.2 connections allowed on TLS 1.3 sockets
Summary
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 ClientHello advertises both versions and the peer can establish TLS 1.2, so applications that assumed `IPPROTO_TLS_1_3` enforces TLS 1.3 may silently use TLS 1.2 and remain exposed to TLS 1.2-specific weaknesses. As a workaround, the `TLS_CIPHERSUITE_LIST` socket option can be restricted to TLS 1.3-only cipher suites.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 16:31 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| zephyrproject-rtos | Zephyr |
Affected:
* , ≤ 4.3
(git)
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CVE-2025-59270 (GCVE-0-2025-59270)
Vulnerability from cvelistv5 – Published: 2025-09-16 14:41 – Updated: 2025-09-30 14:52
VLAI
EPSS
VEX
Title
psPAS does not enforce TLS 1.2 within Get-PASSAMLResponse
Summary
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 a deprecated protocol. Fixed in 7.0.209.
Severity
SSVC
Exploitation: poc
Automatable: no
Technical Impact: partial
CISA Coordinator · cisa-cg (v2.0.3)
Decision recorded 2025-09-15 18:22 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
References
Impacted products
Date Public
2025-09-09 00:00
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CVE-2025-36582 (GCVE-0-2025-36582)
Vulnerability from cvelistv5 – Published: 2025-07-01 13:12 – Updated: 2025-07-01 13:32
VLAI
EPSS
VEX
Summary
Dell NetWorker, versions 19.12.0.1 and prior, contains a Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade') vulnerability. An unauthenticated attacker with remote access could potentially exploit this vulnerability, leading to Information disclosure.
Severity
4.8 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-07-01 13:32 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.dell.com/support/kbdoc/en-us/00033875… | vendor-advisory |
Date Public
2025-07-01 05:00
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CVE-2025-10693 (GCVE-0-2025-10693)
Vulnerability from cvelistv5 – Published: 2025-10-31 19:20 – Updated: 2025-10-31 19:54
VLAI
EPSS
VEX
Title
Silicon Labs Z-Wave PIR Sensor Joins Network as Non-Secure
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-31 19:54 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://community.silabs.com/068Vm00000WN3J0 | vendor-advisorypermissions-required |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| silabs.com | Silicon Labs Z-Wave SDK |
Affected:
2025.6.0 , ≤ 2025.6.1
(custom)
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CVE-2024-23656 (GCVE-0-2024-23656)
Vulnerability from cvelistv5 – Published: 2024-01-25 19:45 – Updated: 2025-06-03 18:20
VLAI
EPSS
VEX
Title
Dex 2.37.0 is discarding TLSconfig and always serves deprecated TLS 1.0/1.1 and insecure ciphers
Summary
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 reloader` was introduced in v2.37.0. Configured cipher suites are not respected either. This issue is fixed in Dex 2.38.0.
Severity
7.5 (High)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-03 18:20 UTC
CWE
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/dexidp/dex/security/advisories… | x_refsource_CONFIRM |
| https://github.com/dexidp/dex/issues/2848 | x_refsource_MISC |
| https://github.com/dexidp/dex/pull/2964 | x_refsource_MISC |
| https://github.com/dexidp/dex/commit/5bbdb4420254… | x_refsource_MISC |
| https://github.com/dexidp/dex/blob/70d7a2c7c1bb26… | x_refsource_MISC |
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CVE-2024-20069 (GCVE-0-2024-20069)
Vulnerability from cvelistv5 – Published: 2024-06-03 02:04 – Updated: 2024-08-01 21:52
VLAI
EPSS
VEX
Summary
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: MOLY01286330; Issue ID: MSV-1430.
Severity
6.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-06-03 18:16 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
1 reference
Impacted products
17 products
| Vendor | Product | Version | |
|---|---|---|---|
| MediaTek, Inc. | MT6833, MT6853, MT6855, MT6873, MT6875, MT6875T, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8675, MT8771, MT8791T, MT8797 |
Affected:
Modem NR15
|
|
| mediatek | mt6833 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6833:*:*:*:*:*:*:*:* |
|
| mediatek | mt6853 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6853:*:*:*:*:*:*:*:* |
|
| mediatek | mt6855 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6855:*:*:*:*:*:*:*:* |
|
| mediatek | mt6873 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6873:*:*:*:*:*:*:*:* |
|
| mediatek | mt6875 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6875:*:*:*:*:*:*:*:* |
|
| mediatek | mt6875t |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6875t:*:*:*:*:*:*:*:* |
|
| mediatek | mt6877 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6877:*:*:*:*:*:*:*:* |
|
| mediatek | mt6883 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6883:*:*:*:*:*:*:*:* |
|
| mediatek | mt6885 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6885:*:*:*:*:*:*:*:* |
|
| mediatek | mt6889 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6889:*:*:*:*:*:*:*:* |
|
| mediatek | mt6891 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6891:*:*:*:*:*:*:*:* |
|
| mediatek | mt6893 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt6893:*:*:*:*:*:*:*:* |
|
| mediatek | mt8675 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt8675:*:*:*:*:*:*:*:* |
|
| mediatek | mt8771 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt8771:*:*:*:*:*:*:*:* |
|
| mediatek | mt8791t |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt8791t:*:*:*:*:*:*:*:* |
|
| mediatek | mt8797 |
Affected:
0 , < *
(custom)
cpe:2.3:h:mediatek:mt8797:*:*:*:*:*:*:*:* |
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"product": "MT6833, MT6853, MT6855, MT6873, MT6875, MT6875T, MT6877, MT6883, MT6885, MT6889, MT6891, MT6893, MT8675, MT8771, MT8791T, MT8797",
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CVE-2024-8773 (GCVE-0-2024-8773)
Vulnerability from cvelistv5 – Published: 2025-03-24 12:33 – Updated: 2025-03-24 13:02
VLAI
EPSS
VEX
Title
Protocol Downgrade in SIMPLE.ERP
Summary
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 6.30@a03.9, which make it possible for an administrator to enforce encrypted communication. Versions 6.20 and 6.25 remain unpatched.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-24 13:02 UTC
CWE
- CWE-757 - Selection of Less-Secure Algorithm During Negotiation ('Algorithm Downgrade')
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://cert.pl/en/posts/2025/03/CVE-2024-8773/ | third-party-advisory |
| https://cert.pl/posts/2025/03/CVE-2024-8773/ | third-party-advisory |
| https://simple.com.pl/produkty/simple-erp/dla-kogo/ | product |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| Simple SA | SIMPLE.ERP |
Affected:
6.20 , < 6.30@a03.9
(custom)
|
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{
"metrics": [
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"credits": [
{
"lang": "en",
"type": "finder",
"value": "dr in\u017c. Marcin Ochab"
}
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"impacts": [
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"capecId": "CAPEC-569",
"descriptions": [
{
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"metrics": [
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"Recovery": "NOT_DEFINED",
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"url": "https://simple.com.pl/produkty/simple-erp/dla-kogo/"
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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.