Common Weakness Enumeration

CWE-394

Allowed

Unexpected Status Code or Return Value

Abstraction: Base · Status: Draft

The product does not properly check when a function or operation returns a value that is legitimate for the function, but is not expected by the product.

18 vulnerabilities reference this CWE, most recent first.

CVE-2026-123158 (GCVE-0-2026-123158)

Vulnerability from cvelistv5 – Published: 2026-11-05 15:46 – Updated: 2026-11-10 00:11
VLAI
Summary
sshd in OpenSSH before 10.6p2 on Linux, when musl libc is used without PAM, lacks a workaround for a password authentication bypass (related to misinterpretation of whether a string is intended to be a password hash). For some configurations of accounts, any password between 256 and 1024 characters succeeds. An example of a platform using musl libc without PAM is Alpine Linux.
SSVC
Exploitation: active Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-11-09 16:50 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
mitre CNA
Impacted products
Vendor Product Version
OpenBSD OpenSSH Affected: 0 , < 10.6p2 (custom)
    cpe:2.3:a:openbsd:openssh:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2026-107785 (GCVE-0-2026-107785)

Vulnerability from cvelistv5 – Published: 2026-10-09 13:15 – Updated: 2026-10-09 16:46
VLAI
Title
Crux Agent silently fails SKA preshared key rotation when SHA-512 peering is negotiated
Summary
Crux Agent from 1.9.0 before 2.0.3 uses the full SKA bilocation key as the WireGuard preshared key. When a peering session negotiates use of SHA-512, the key produced is 64 bytes instead of the 32 bytes WireGuard requires. The agent does not validate this size; instead it attempts to use the `wg set` command to update the live tunnel, and write the invalid key to the WireGuard configuration file. The update fails, so the live tunnel keeps using its previous preshared key until the tunnel is shut down. The tunnel will fail to start when restarted. For a peer which has never successfully negotiated a 32-byte bilocation key in a Crux C2 organization which has the "Enforce SKA Use" setting turned off, no preshared key will be set for the tunnel. Therefore, an attacker who is able to intercept and store the peer's traffic, and has access (or will have access) to a cryptographically relevant quantum computer, will be able to decrypt the tunnel.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-09 16:15 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
  • CWE-252 - Unchecked Return Value
  • CWE-325 - Missing Cryptographic Step
Assigner
sirius CNA
References
Impacted products
Vendor Product Version
Sirius Computer, Inc. Crux Agent Affected: 1.9.0 , < 2.0.3 (semver)
Create a notification for this product.
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CVE-2026-76956 (GCVE-0-2026-76956)

Vulnerability from cvelistv5 – Published: 2026-08-20 04:22 – Updated: 2026-08-20 17:42
VLAI
Summary
In libexpat 2.8.2 and 2.8.3 before 2.8.4, misinterpretation of getentropy's return code leads to insufficient entropy, which results in being vulnerable to hash flooding attacks, causing a denial of service via crafted XML content.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-08-20 15:05 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
mitre CNA
Impacted products
Vendor Product Version
libexpat project libexpat Affected: 2.8.2 , < 2.8.4 (semver)
    cpe:2.3:a:libexpat_project:libexpat:*:*:*:*:*:*:*:*
Create a notification for this product.
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CVE-2026-73064 (GCVE-0-2026-73064)

Vulnerability from cvelistv5 – Published: 2026-09-24 14:58 – Updated: 2026-09-24 18:00
VLAI
Summary
In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-24 18:00 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
mitre CNA
Impacted products
Vendor Product Version
trustedfirmware Mbed TLS Affected: 3.2.0 , < 3.6.7 (semver)
Affected: 4.0.0 , < 4.1.1 (semver)
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CVE-2026-25085 (GCVE-0-2026-25085)

Vulnerability from cvelistv5 – Published: 2026-02-27 00:33 – Updated: 2026-03-02 18:58
VLAI
Title
Copeland XWEB and XWEB Pro Unexpected Status Code or Return Value
Summary
A vulnerability exists in Copeland XWEB Pro version 1.12.1 and prior, in which an unexpected return value from the authentication routine is later on processed as a legitimate value, resulting in an authentication bypass.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-02 18:58 UTC
CWE
Assigner
icscert CNA
Impacted products
Show details on NVD website

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CVE-2025-48510 (GCVE-0-2025-48510)

Vulnerability from cvelistv5 – Published: 2025-11-24 20:56 – Updated: 2025-11-24 21:07
VLAI
Summary
Improper return value within AMD uProf can allow a local attacker to bypass KSLR, potentially resulting in loss of confidentiality or availability.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-11-24 21:06 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
AMD CNA
Impacted products
Vendor Product Version
AMD AMD μProf Unaffected: 5.0
Create a notification for this product.
Date Public
2025-11-24 20:58
Show details on NVD website

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CVE-2025-23013 (GCVE-0-2025-23013)

Vulnerability from cvelistv5 – Published: 2025-01-15 00:00 – Updated: 2025-02-03 10:03
VLAI
Summary
In Yubico pam-u2f before 1.3.1, local privilege escalation can sometimes occur. This product implements a Pluggable Authentication Module (PAM) that can be deployed to support authentication using a YubiKey or other FIDO compliant authenticators on macOS or Linux. This software package has an issue that allows for an authentication bypass in some configurations. An attacker would require the ability to access the system as an unprivileged user. Depending on the configuration, the attacker may also need to know the user's password.
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-15 14:51 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
mitre CNA
Impacted products
Vendor Product Version
Yubico pam-u2f Affected: 0 , < 1.3.1 (semver)
    cpe:2.3:a:yubico:pam-u2f:*:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2025-22854 (GCVE-0-2025-22854)

Vulnerability from cvelistv5 – Published: 2025-06-15 15:00 – Updated: 2025-06-16 18:07
VLAI
Title
Possible thread exhaustion from processing http responses in PingFederate Google Adapter
Summary
Improper handling of non-200 http responses in the PingFederate Google Adapter leads to thread exhaustion under normal usage conditions.
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-16 18:07 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
Impacted products
Vendor Product Version
Ping Identity PingFederate Affected: 1.0.1 , < 1.5.2 (custom)
Create a notification for this product.
Show details on NVD website

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CVE-2025-12516 (GCVE-0-2025-12516)

Vulnerability from cvelistv5 – Published: 2025-10-30 15:42 – Updated: 2025-10-30 17:24
VLAI
Title
Lack of Graceful Error Handling - HTTP 5xx Error
Summary
Lack of Graceful Error Handling - HTTP 5xx ErrorThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-30 17:24 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
References
Impacted products
Show details on NVD website

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CVE-2025-12515 (GCVE-0-2025-12515)

Vulnerability from cvelistv5 – Published: 2025-10-30 15:38 – Updated: 2025-10-30 17:27
VLAI
Title
Systemic Internal Server Errors - HTTP 500 Response
Summary
Systemic Internal Server Errors - HTTP 500 ResponseThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-30 17:25 UTC
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
References
Impacted products
Show details on NVD website

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No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.