Common Weakness Enumeration
CWE-204
AllowedObservable Response Discrepancy
Abstraction: Base · Status: Incomplete
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.
364 vulnerabilities reference this CWE, most recent first.
CVE-2025-3939 (GCVE-0-2025-3939)
Vulnerability from cvelistv5 – Published: 2025-05-22 12:33 – Updated: 2025-05-22 14:02
VLAI
EPSS
VEX
Title
Observable Response Discrepancy
Summary
Observable Response Discrepancy vulnerability in Tridium Niagara Framework on Windows, Linux, QNX, Tridium Niagara Enterprise Security on Windows, Linux, QNX allows Cryptanalysis. This issue affects Niagara Framework: before 4.14.2, before 4.15.1, before 4.10.11; Niagara Enterprise Security: before 4.14.2, before 4.15.1, before 4.10.11.Tridium recommends upgrading to Niagara Framework and Enterprise Security versions 4.14.2u2, 4.15.u1, or 4.10u.11.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-22 14:01 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
| URL | Tags |
|---|---|
| https://honeywell.com/us/en/product-security#secu… | vendor-advisory |
| https://docs.niagara-community.com/category/tech_bull | vendor-advisory |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Tridium | Niagara Framework |
Affected:
0 , < 4.14.2
(custom)
Affected: 0 , < 4.15.1 (custom) Affected: 0 , < 4.10.11 (custom) |
|
| Tridium | Niagara Enterprise Security |
Affected:
0 , < 4.14.2
(custom)
Affected: 0 , < 4.15.1 (custom) Affected: 0 , < 4.10.11 (custom) |
Date Public
2025-05-08 16:59
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CVE-2025-3716 (GCVE-0-2025-3716)
Vulnerability from cvelistv5 – Published: 2026-03-30 07:30 – Updated: 2026-03-30 15:19
VLAI
EPSS
VEX
Title
User enumeration in ESET Protect (on-prem)
Summary
User enumeration in ESET Protect (on-prem) via Response Timing.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-03-30 15:18 UTC
CWE
- CWE-204 - Observable response discrepancy
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://help.eset.com/changelogs/?product=protect… | release-notes |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| ESET, spol. s.r.o | ESET Protect (on-prem) |
Unaffected:
12.1.1.0
(custom)
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CVE-2025-3092 (GCVE-0-2025-3092)
Vulnerability from cvelistv5 – Published: 2025-06-24 08:14 – Updated: 2025-06-24 13:55
VLAI
EPSS
VEX
Title
MB connect line: Observable response discrepancy in mbCONNECT24/mymbCONNECT24
Summary
An unauthenticated remote attacker can enumerate valid user names from an unprotected endpoint.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-24 13:55 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
2 references
Impacted products
7 products
| Vendor | Product | Version | |
|---|---|---|---|
| Helmholz | myREX24 |
Affected:
0 , < 2.18.0
(semver)
|
|
| Helmholz | myREX24 |
Affected:
0 , < 2.16.5
(semver)
|
|
| Helmholz | myREX24.virtual |
Affected:
0 , < 2.18.0
(semver)
|
|
| Helmholz | myREX24.virtual |
Affected:
0 , < 2.16.5
(semver)
|
|
| MB connect line | mbCONNECT24 |
Affected:
0 , < 2.16.5
(semver)
|
|
| MB connect line | mymbCONNECT24 |
Affected:
0 , < 2.18.0
(semver)
|
|
| MB connect line | mymbCONNECT24 |
Affected:
0 , < 2.16.5
(semver)
|
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CVE-2025-2910 (GCVE-0-2025-2910)
Vulnerability from cvelistv5 – Published: 2025-03-28 12:53 – Updated: 2025-03-28 13:47
VLAI
EPSS
VEX
Title
User enumeration vulnerability in MeetMe products
Summary
User enumeration in the password reset module of the MeetMe authentication service in versions prior to 2024-09 allows an attacker to determine whether an email address is registered through specific error messages.
Severity
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-03-28 13:47 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
Date Public
2025-03-28 11:00
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CVE-2025-1101 (GCVE-0-2025-1101)
Vulnerability from cvelistv5 – Published: 2025-02-12 13:26 – Updated: 2025-02-17 10:07
VLAI
EPSS
VEX
Summary
A CWE-204 "Observable Response Discrepancy" in the login page in Q-Free MaxTime less than or equal to version 2.11.0 allows an unauthenticated remote attacker to enumerate valid usernames via crafted HTTP requests.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-02-12 14:26 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
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CVE-2025-0693 (GCVE-0-2025-0693)
Vulnerability from cvelistv5 – Published: 2025-01-23 21:22 – Updated: 2025-10-14 18:42 Exclusively Hosted Service
VLAI
EPSS
VEX
Title
Issue with AWS Sign-in IAM User Login Flow - Possible Username Enumeration
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-01-24 19:45 UTC
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://aws.amazon.com/security/security-bulletin… | vendor-advisory |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| AWS | AWS Sign-in IAM Login Flow |
Affected:
N/A
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CVE-2025-0163 (GCVE-0-2025-0163)
Vulnerability from cvelistv5 – Published: 2025-06-11 14:20 – Updated: 2025-08-24 11:55
VLAI
EPSS
VEX
Title
IBM Security Verify Access information disclosure
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-06-11 14:40 UTC
CWE
- CWE-204 - Response Discrepancy Information Exposure
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7236314 | vendor-advisorypatch |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | Security Verify Access |
Affected:
10.0 , ≤ 10.0.8
(semver)
cpe:2.3:a:ibm:security_verify_access:10.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:security_verify_access:10.0.8:*:*:*:*:*:*:* |
|
| IBM | Security Verify Access Docker |
Affected:
10.0 , ≤ 10.0.8
(semver)
cpe:2.3:a:ibm:security_verify_access_docker:10.0.0:*:*:*:*:*:*:* cpe:2.3:a:ibm:security_verify_access_docker:10.0.8:*:*:*:*:*:*:* |
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GCVE-1-2025-0003
Vulnerability from gna-1 – Published: 2025-08-22 12:33 – Updated: 2025-08-23 07:55
VLAI
EPSS
VEX
Summary
Incorrect ACL for user settings edit, which previously allowed enumeration of usernames.
Severity
References
1 reference
| URL | Tags |
|---|---|
| https://github.com/cerebrate-project/cerebrate/co… | patch |
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CVE-2024-56476 (GCVE-0-2024-56476)
Vulnerability from cvelistv5 – Published: 2025-04-02 15:33 – Updated: 2025-09-01 00:57
VLAI
EPSS
VEX
Title
IBM TXSeries for Multiplatforms information disclosure
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.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-04-02 16:26 UTC
CWE
- CWE-204 - Response Discrepancy Information Exposure
Assigner
References
1 reference
| URL | Tags |
|---|---|
| https://www.ibm.com/support/pages/node/7229880 | vendor-advisorypatch |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| IBM | TXSeries for Multiplatforms |
Affected:
9.1
Affected: 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-2024-51447 (GCVE-0-2024-51447)
Vulnerability from cvelistv5 – Published: 2025-05-13 09:38 – Updated: 2025-05-13 15:57
VLAI
EPSS
VEX
Summary
A vulnerability has been identified in Polarion V2310 (All versions), Polarion V2404 (All versions < V2404.2). The login implementation of the affected application contains an observable response discrepancy vulnerability when validating usernames. This could allow an unauthenticated remote attacker to distinguish between valid and invalid usernames.
Severity
5.3 (Medium)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-05-13 15:43 UTC
CWE
- CWE-204 - Observable Response Discrepancy
Assigner
References
1 reference
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Siemens | Polarion V2310 |
Affected:
0 , < *
(custom)
|
|
| Siemens | Polarion V2404 |
Affected:
0 , < V2404.2
(custom)
|
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Mitigation MIT-46
Architecture and Design
Strategy: Separation of Privilege
- 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 MIT-39
Implementation
- 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.