CWE-204

Observable Response Discrepancy

The product provides different responses to incoming requests in a way that reveals internal state information to an unauthorized actor outside of the intended control sphere.

CVE-2024-56476 (GCVE-0-2024-56476)
Vulnerability from cvelistv5
Published
2025-04-02 15:33
Modified
2025-09-01 00:57
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
IBM TXSeries for Multiplatforms 9.1 and 11.1 could allow an attacker to enumerate usernames due to an observable login attempt response discrepancy.
References
Impacted products
Vendor Product Version
IBM TXSeries for Multiplatforms Version: 9.1
Version: 11.1
    cpe:2.3:a:ibm:txseries_for_multiplatforms:9.1:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:txseries_for_multiplatforms:11.1:*:*:*:*:*:*:*
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CVE-2025-0163 (GCVE-0-2025-0163)
Vulnerability from cvelistv5
Published
2025-06-11 14:20
Modified
2025-08-24 11:55
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Summary
IBM Security Verify Access Appliance and Docker 10.0 through 10.0.8 could allow a remote attacker to enumerate usernames due to an observable response discrepancy of disabled accounts.
References
Impacted products
Vendor Product Version
IBM Security Verify Access Version: 10.0   ≤ 10.0.8
    cpe:2.3:a:ibm:security_verify_access:10.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:security_verify_access:10.0.8:*:*:*:*:*:*:*
 Create a notification for this product.
   IBM Security Verify Access Docker Version: 10.0   ≤ 10.0.8
    cpe:2.3:a:ibm:security_verify_access_docker:10.0.0:*:*:*:*:*:*:*
    cpe:2.3:a:ibm:security_verify_access_docker:10.0.8:*:*:*:*:*:*:*
 Create a notification for this product.
Show details on NVD website

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CVE-2025-0693 (GCVE-0-2025-0693)
Vulnerability from cvelistv5
Published
2025-01-23 21:22
Modified
2025-10-14 18:42
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-204 - Observable Response Discrepancy
  • CWE-208 - Observable Timing Discrepancy
Summary
Variable response times in the AWS Sign-in IAM user login flow allowed for the use of brute force enumeration techniques to identify valid IAM usernames in an arbitrary AWS account.
References
Impacted products
Vendor Product Version
AWS AWS Sign-in IAM Login Flow Version: N/A
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CVE-2025-27451 (GCVE-0-2025-27451)
Vulnerability from cvelistv5
Published
2025-07-03 11:27
Modified
2025-07-03 13:16
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
For failed login attempts, the application returns different error messages depending on whether the login failed due to an incorrect password or a non-existing username. This allows an attacker to guess usernames until they find an existing one.
References
Impacted products
Vendor Product Version
Endress+Hauser Endress+Hauser MEAC300-FNADE4 Version: 0   <
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CVE-2025-34254 (GCVE-0-2025-34254)
Vulnerability from cvelistv5
Published
2025-10-16 18:52
Modified
2025-10-17 14:29
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The application's 'Login' endpoint returns distinct JSON responses depending on whether the supplied username is associated with an existing account. Because the responses differ in the `error.message`string value, an unauthenticated remote attacker can enumerate valid usernames/accounts on the server. NOTE: D-Link states that a fix is under development.
References
Impacted products
Vendor Product Version
D-Link Nuclias Connect Version: *   ≤
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CVE-2025-34255 (GCVE-0-2025-34255)
Vulnerability from cvelistv5
Published
2025-10-16 18:52
Modified
2025-10-17 14:29
Severity ?
6.9 (Medium) - CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
D-Link Nuclias Connect firmware versions <= 1.3.1.4 contain an observable response discrepancy vulnerability. The application's 'Forgot Password' endpoint returns distinct JSON responses depending on whether the supplied email address is associated with an existing account. Because the responses differ in the `data.exist` boolean value, an unauthenticated remote attacker can enumerate valid email addresses/accounts on the server. NOTE: D-Link states that a fix is under development.
References
Impacted products
Vendor Product Version
D-Link Nuclias Connect Version: *   ≤
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CVE-2025-42903 (GCVE-0-2025-42903)
Vulnerability from cvelistv5
Published
2025-10-14 00:17
Modified
2025-10-14 15:22
Severity ?
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
A vulnerability in SAP Financial Service Claims Management RFC function ICL_USER_GET_NAME_AND_ADDRESS allows user enumeration and potential disclosure of personal data through response discrepancies, causing low impact on confidentiality with no impact on integrity or availability.
References
Impacted products
Vendor Product Version
SAP_SE SAP Financial Service Claims Management Version: INSURANCE 803
Version: 804
Version: 805
Version: 806
Version: S4CEXT 107
Version: 108
Version: 109
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CVE-2025-46390 (GCVE-0-2025-46390)
Vulnerability from cvelistv5
Published
2025-08-06 10:55
Modified
2025-08-06 13:12
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
CWE-204: Observable Response Discrepancy
References
Impacted products
Vendor Product Version
Emby MediaBrowser Version: 4.9.0.35
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CVE-2025-52899 (GCVE-0-2025-52899)
Vulnerability from cvelistv5
Published
2025-07-29 19:16
Modified
2025-07-29 19:34
Severity ?
5.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
Tuleap is an Open Source Suite created to facilitate management of software development and collaboration. In Tuleap Community Edition prior to version 16.9.99.1750843170 and Tuleap Enterprise Edition prior to 16.8-4 and 16.9-2, the forgot password form allows for user enumeration. This is fixed in Tuleap Community Edition version 16.9.99.1750843170 and Tuleap Enterprise Edition 16.8-4 and 16.9-2.
References
Impacted products
Vendor Product Version
Enalean tuleap Version: Tuleap Community Edition < 16.9.99.1750843170
Version: Tuleap Enterprise Edition >= 16.9, < 16.9-2
Version: Tuleap Enterprise Edition < 16.8-4
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CVE-2025-54129 (GCVE-0-2025-54129)
Vulnerability from cvelistv5
Published
2025-07-21 20:53
Modified
2025-07-22 20:44
Severity ?
4.3 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Summary
HAXiam is a packaging wrapper for HAXcms which allows anyone to spawn their own microsite management platform. In versions 11.0.4 and below, the application returns a 200 response when requesting the data of a valid user and a 404 response when requesting the data of an invalid user. This can be used to infer the existence of valid user accounts. An authenticated attacker can use automated tooling to brute force potential usernames and use the application's response to identify valid accounts. This can be used in conjunction with other vulnerabilities, such as the lack of authorization checks, to enumerate and deface another user's sites. This is fixed in version 11.0.5.
References
Impacted products
Vendor Product Version
haxtheweb issues Version: < 11.0.5
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Mitigation ID: MIT-46

Phase: Architecture and Design

Strategy: Separation of Privilege

Description:

  • Compartmentalize the system to have "safe" areas where trust boundaries can be unambiguously drawn. Do not allow sensitive data to go outside of the trust boundary and always be careful when interfacing with a compartment outside of the safe area.
  • Ensure that appropriate compartmentalization is built into the system design, and the compartmentalization allows for and reinforces privilege separation functionality. Architects and designers should rely on the principle of least privilege to decide the appropriate time to use privileges and the time to drop privileges.
Mitigation ID: MIT-39

Phase: Implementation

Description:

  • Ensure that error messages only contain minimal details that are useful to the intended audience and no one else. The messages need to strike the balance between being too cryptic (which can confuse users) or being too detailed (which may reveal more than intended). The messages should not reveal the methods that were used to determine the error. Attackers can use detailed information to refine or optimize their original attack, thereby increasing their chances of success.
  • If errors must be captured in some detail, record them in log messages, but consider what could occur if the log messages can be viewed by attackers. Highly sensitive information such as passwords should never be saved to log files.
  • Avoid inconsistent messaging that might accidentally tip off an attacker about internal state, such as whether a user account exists or not.
CAPEC-331: ICMP IP Total Length Field Probe

An adversary sends a UDP packet to a closed port on the target machine to solicit an IP Header's total length field value within the echoed 'Port Unreachable" error message. This type of behavior is useful for building a signature-base of operating system responses, particularly when error messages contain other types of information that is useful identifying specific operating system responses.

CAPEC-332: ICMP IP 'ID' Field Error Message Probe

An adversary sends a UDP datagram having an assigned value to its internet identification field (ID) to a closed port on a target to observe the manner in which this bit is echoed back in the ICMP error message. This allows the attacker to construct a fingerprint of specific OS behaviors.

CAPEC-541: Application Fingerprinting

An adversary engages in fingerprinting activities to determine the type or version of an application installed on a remote target.

CAPEC-580: System Footprinting

An adversary engages in active probing and exploration activities to determine security information about a remote target system. Often times adversaries will rely on remote applications that can be probed for system configurations.

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