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Common Weakness Enumeration

CWE-204

Allowed

Observable Response Discrepancy

Abstraction: Base · Status: Incomplete

API response cwe.mitre.org

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.

341 vulnerabilities reference this CWE, most recent first.

CVE-2021-20556 (GCVE-0-2021-20556)

Vulnerability from cvelistv5 – Published: 2024-05-03 17:31 – Updated: 2024-08-03 17:45
VLAI
Title
IBM Cognos Controller information disclosure
Summary
IBM Cognos Controller 10.4.1, 10.4.2, and 11.0.0 could allow a remote user to enumerate usernames due to differentiating error messages on existing usernames. IBM X-Force ID: 199181.
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-06 15:50 UTC
CWE
  • CWE-204 - Response Discrepancy Information Exposure
Assigner
References
Impacted products
Vendor Product Version
IBM Cognos Controller Affected: 10.4.1, 10.4.2, 11.0.0
Create a notification for this product.
ibm cognos_controller Affected: 10.4.1
    cpe:2.3:a:ibm:cognos_controller:10.4.1:*:*:*:*:*:*:*
Create a notification for this product.
ibm cognos_controller Affected: 10.4.2
    cpe:2.3:a:ibm:cognos_controller:10.4.2:*:*:*:*:*:*:*
Create a notification for this product.
ibm cognos_controller Affected: 11.0.0
    cpe:2.3:a:ibm:cognos_controller:11.0.0:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2021-20049 (GCVE-0-2021-20049)

Vulnerability from cvelistv5 – Published: 2021-12-23 01:20 – Updated: 2024-08-03 17:30
VLAI
Summary
A vulnerability in SonicWall SMA100 password change API allows a remote unauthenticated attacker to perform SMA100 username enumeration based on the server responses. This vulnerability impacts 10.2.1.2-24sv, 10.2.0.8-37sv and earlier 10.x versions.
Severity
No CVSS data available.
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
SonicWall SonicWall SMA100 Affected: 10.2.0.8-37sv and earlier
Affected: 10.2.1.2-24sv and earlier
Create a notification for this product.
Show details on NVD website
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CVE-2020-11063 (GCVE-0-2020-11063)

Vulnerability from cvelistv5 – Published: 2020-05-13 22:15 – Updated: 2024-12-03 19:08
VLAI
Title
Observable Response Discrepancy in TYPO3 CMS
Summary
In TYPO3 CMS versions 10.4.0 and 10.4.1, it has been discovered that time-based attacks can be used with the password reset functionality for backend users. This allows an attacker to mount user enumeration based on email addresses assigned to backend user accounts. This has been fixed in 10.4.2.
Severity
3.7 (Low)
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
TYPO3 TYPO3 CMS Affected: >= 10.4.0, <= 10.4.1
Create a notification for this product.
Show details on NVD website
To clipboard 

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CVE-2019-25338 (GCVE-0-2019-25338)

Vulnerability from cvelistv5 – Published: 2026-02-12 22:48 – Updated: 2026-03-05 01:26
VLAI
Title
Dokuwiki 2018-04-22b - Username Enumeration
Summary
DokuWiki 2018-04-22b contains a username enumeration vulnerability in its password reset functionality that allows attackers to identify valid user accounts. Attackers can submit different usernames to the password reset endpoint and distinguish between existing and non-existing accounts by analyzing the server's error response messages.
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
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
SSVC
Exploitation: poc Automatable: yes Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-02-13 17:05 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
Dokuwiki Dokuwiki Affected: 2018-04-22b "Greebo"
    cpe:2.3:a:dokuwiki:dokuwiki:2023-04-04:*:*:*:*:*:*:*
Create a notification for this product.
Date Public
2019-12-01 00:00
Credits
Talha ŞEN
Show details on NVD website
To clipboard 

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CVE-2018-25350 (GCVE-0-2018-25350)

Vulnerability from cvelistv5 – Published: 2026-05-23 18:30 – Updated: 2026-05-26 13:27
VLAI
Title
userSpice 4.3.24 Username Enumeration via existingUsernameCheck.php
Summary
userSpice 4.3.24 contains a username enumeration vulnerability that allows unauthenticated attackers to discover valid usernames by sending POST requests to the existingUsernameCheck.php endpoint. Attackers can submit usernames and analyze response text for the 'taken' string to identify existing accounts in the system.
Severity
9.3 (Critical)
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: poc Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-26 13:27 UTC
CWE
  • CWE-204 - Observable Response Discrepancy
Assigner
References
Impacted products
Vendor Product Version
UserSpice userSpice Affected: 4.3.24
Create a notification for this product.
Date Public
2018-06-10 00:00
Credits
Dolev Farhi
Show details on NVD website
To clipboard 

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CVE-2016-9499 (GCVE-0-2016-9499)

Vulnerability from cvelistv5 – Published: 2018-07-13 20:00 – Updated: 2024-08-06 02:50
VLAI
Title
The Accellion FTP server prior to version FTA_9_12_220 is vulnerable to cross-site scripting.
Summary
Accellion FTP server prior to version FTA_9_12_220 only returns the username in the server response if the username is invalid. An attacker may use this information to determine valid user accounts and enumerate them.
Severity
No CVSS data available.
CWE
Assigner
References
URL Tags
https://www.qualys.com/2016/12/06/qsa-2016-12-06/… x_refsource_MISC
https://www.securityfocus.com/bid/96154 vdb-entryx_refsource_BID
https://www.kb.cert.org/vuls/id/745607 third-party-advisoryx_refsource_CERT-VN
Impacted products
Vendor Product Version
Accellion FTP Server Affected: FTA_9_12_220 , < FTA_9_12_220 (custom)
Create a notification for this product.
Date Public
2017-02-08 00:00
Credits
Thanks to Ashish Kamble for reporting this vulnerability.
Show details on NVD website
To clipboard 

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GHSA-256Q-HX8W-XCQX

Vulnerability from github – Published: 2025-04-10 20:12 – Updated: 2025-04-10 20:12
VLAI
Summary
Silverstripe Framework user enumeration via timing attack on login and password reset forms
Details

Impact

User enumeration is possible by performing a timing attack on the login or password reset pages with user credentials.

This was originally disclosed in https://www.silverstripe.org/download/security-releases/ss-2017-005/ for CMS 3 but was not patched in CMS 4+

References

  • https://www.silverstripe.org/download/security-releases/ss-2017-005
  • https://www.silverstripe.org/download/security-releases/ss-2025-001
Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Show details on source website
To clipboard 

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          "events": [
            {
              "introduced": "4.0.0"
            },
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          ],
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  "modified": "2025-04-10T20:12:55Z",
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}

GHSA-258M-GGV2-XXV3

Vulnerability from github – Published: 2023-05-22 21:30 – Updated: 2024-04-04 04:16
VLAI
Details

When supplied with a random MAC address, Snap One OvrC cloud servers will return information about the device. The MAC address of devices can be enumerated in an attack and the OvrC cloud will disclose their information.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Show details on source website
To clipboard 

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    "nvd_published_at": "2023-05-22T20:15:10Z",
    "severity": "MODERATE"
  },
  "details": "\n\n\n\n\n\n\n\n\nWhen supplied with a random MAC address, Snap One OvrC cloud servers will return information about the device. The MAC address of devices can be enumerated in an attack and the OvrC cloud will disclose their information.\n\n\n\n\n\n\n\n\n\n\n\n\n",
  "id": "GHSA-258m-ggv2-xxv3",
  "modified": "2024-04-04T04:16:44Z",
  "published": "2023-05-22T21:30:25Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2023-28412"
    },
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      "type": "WEB",
      "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-23-136-01"
    },
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      "type": "WEB",
      "url": "https://www.control4.com/docs/product/ovrc-software/release-notes/english/latest/ovrc-software-release-notes-rev-r.pdf"
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      "type": "CVSS_V3"
    }
  ]
}

GHSA-26XJ-R8R2-VVGX

Vulnerability from github – Published: 2025-06-12 15:31 – Updated: 2025-06-12 15:31
VLAI
Details

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.

Severity
5.3 (Medium)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Show details on source website
To clipboard 

{
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  "aliases": [
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  ],
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    "github_reviewed_at": null,
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    "severity": "MODERATE"
  },
  "details": "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.",
  "id": "GHSA-26xj-r8r2-vvgx",
  "modified": "2025-06-12T15:31:23Z",
  "published": "2025-06-12T15:31:22Z",
  "references": [
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      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-49187"
    },
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      "type": "WEB",
      "url": "https://cdn.sick.com/media/docs/1/11/411/Special_information_CYBERSECURITY_BY_SICK_en_IM0084411.PDF"
    },
    {
      "type": "WEB",
      "url": "https://sick.com/psirt"
    },
    {
      "type": "WEB",
      "url": "https://www.cisa.gov/resources-tools/resources/ics-recommended-practices"
    },
    {
      "type": "WEB",
      "url": "https://www.first.org/cvss/calculator/3.1"
    },
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      "type": "WEB",
      "url": "https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0007.json"
    },
    {
      "type": "WEB",
      "url": "https://www.sick.com/.well-known/csaf/white/2025/sca-2025-0007.pdf"
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      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
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}

GHSA-2FFW-H4MH-JJH5

Vulnerability from github – Published: 2025-11-18 15:30 – Updated: 2025-11-20 15:30
VLAI
Details

Windu CMS is vulnerable to User Enumeration. This issue occurs during logon, where a difference in messages could allow an attacker to determine if the login is valid or not, enabling a brute force attack with valid logins.

The vendor was notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Only version 4.1 was tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.

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
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{
  "affected": [],
  "aliases": [
    "CVE-2025-59116"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-204"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-11-18T15:16:34Z",
    "severity": "MODERATE"
  },
  "details": "Windu CMS is vulnerable to User Enumeration. This issue occurs during logon, where a difference in messages could allow an attacker to determine if the login is valid or not, enabling a brute force attack with valid logins.\n\nThe vendor was notified early about this vulnerability, but didn\u0027t respond with the details of vulnerability or vulnerable version range. Only version 4.1 was tested and confirmed as vulnerable, other versions were not tested and might also be vulnerable.",
  "id": "GHSA-2ffw-h4mh-jjh5",
  "modified": "2025-11-20T15:30:20Z",
  "published": "2025-11-18T15:30:56Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-59116"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/posts/2025/11/CVE-2025-59110"
    },
    {
      "type": "WEB",
      "url": "https://windu.org"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}
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.

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