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.

26 vulnerabilities reference this CWE, most recent first.

CVE-2022-24880 (GCVE-0-2022-24880)

Vulnerability from cvelistv5 – Published: 2022-04-25 22:10 – Updated: 2025-04-23 18:32
VLAI
Title
Potential Captcha Validate Bypass in flask-session-captcha
Summary
flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session. In versions prior to 1.2.1, he `captcha.validate()` function would return `None` if passed no value (e.g. by submitting an having an empty form). If implementing users were checking the return value to be **False**, the captcha verification check could be bypassed. Version 1.2.1 fixes the issue. Users can workaround the issue by not explicitly checking that the value is False. Checking the return value less explicitly should still work.
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-253 - Incorrect Check of Function Return Value
  • CWE-394 - Unexpected Status Code or Return Value
  • CWE-754 - Improper Check for Unusual or Exceptional Conditions
Assigner
Impacted products
Show details on NVD website

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CVE-2019-20924 (GCVE-0-2019-20924)

Vulnerability from cvelistv5 – Published: 2020-11-23 15:30 – Updated: 2024-09-16 20:21
VLAI
Title
Invariant in IndexBoundsBuilder
Summary
A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries which trigger an invariant in the IndexBoundsBuilder. This issue affects MongoDB Server v4.2 versions prior to 4.2.2.
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
References
URL Tags
https://jira.mongodb.org/browse/SERVER-44377 x_refsource_CONFIRM
Impacted products
Vendor Product Version
MongoDB Inc. MongoDB Server Affected: 4.2 , < 4.2.2 (custom)
Create a notification for this product.
Date Public
2020-12-01 00:00
Show details on NVD website

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CVE-2019-0066 (GCVE-0-2019-0066)

Vulnerability from cvelistv5 – Published: 2019-10-09 19:26 – Updated: 2024-09-16 22:15
VLAI
Title
Junos OS: A malformed IPv4 packet received by Junos in an NG-mVPN scenario may cause the routing protocol daemon (rpd) process to core
Summary
An unexpected status return value weakness in the Next-Generation Multicast VPN (NG-mVPN) service of Juniper Networks Junos OS allows attacker to cause a Denial of Service (DoS) condition and core the routing protocol daemon (rpd) process when a specific malformed IPv4 packet is received by the device running BGP. This malformed packet can be crafted and sent to a victim device including when forwarded directly through a device receiving such a malformed packet, but not if the malformed packet is first de-encapsulated from an encapsulated format by a receiving device. Continued receipt of the malformed packet will result in a sustained Denial of Service condition. This issue affects: Juniper Networks Junos OS 15.1 versions prior to 15.1F6-S12, 15.1R7-S2; 15.1X49 versions prior to 15.1X49-D150 on SRX Series; 15.1X53 versions prior to 15.1X53-D68, 15.1X53-D235, 15.1X53-D495, 15.1X53-D590; 16.1 versions prior to 16.1R3-S10, 16.1R4-S12, 16.1R6-S6, 16.1R7-S2; 16.2 versions prior to 16.2R2-S7; 17.1 versions prior to 17.1R2-S9, 17.1R3; 17.2 versions prior to 17.2R1-S7, 17.2R2-S6, 17.2R3; 17.3 versions prior to 17.3R2-S4, 17.3R3.
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
References
Impacted products
Vendor Product Version
Juniper Networks Junos OS Affected: 15.1 , < 15.1F6-S12, 15.1R7-S2 (custom)
Affected: 16.1 , < 16.1R3-S10, 16.1R4-S12, 16.1R6-S6, 16.1R7-S2 (custom)
Affected: 16.2 , < 16.2R2-S7 (custom)
Affected: 17.1 , < 17.1R2-S9, 17.1R3 (custom)
Affected: 17.2 , < 17.2R1-S7, 17.2R2-S6, 17.2R3 (custom)
Affected: 17.3 , < 17.3R2-S4, 17.3R3 (custom)
Affected: 15.1X53 , < 15.1X53-D68, 15.1X53-D235, 15.1X53-D495, 15.1X53-D590 (custom)
Create a notification for this product.
Juniper Networks Junos OS Affected: 15.1X49 , < 15.1X49-D150 (custom)
Create a notification for this product.
Date Public
2019-10-09 00:00
Show details on NVD website

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CVE-2018-20802 (GCVE-0-2018-20802)

Vulnerability from cvelistv5 – Published: 2020-11-23 15:15 – Updated: 2024-09-17 02:26
VLAI
Title
Post-auth queries on compound index may crash mongod
Summary
A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries with compound indexes affecting QueryPlanner. This issue affects MongoDB Server v3.6 versions prior to 3.6.9 and MongoDB Server v4.0 versions prior to 4.0.3.
CWE
  • CWE-394 - Unexpected Status Code or Return Value
Assigner
References
URL Tags
https://jira.mongodb.org/browse/SERVER-36993 x_refsource_CONFIRM
Impacted products
Vendor Product Version
MongoDB Inc. MongoDB Server Affected: 3.6 , < 3.6.9 (custom)
Affected: 4.0 , < 4.0.3 (custom)
Create a notification for this product.
Date Public
2020-11-30 00:00
Show details on NVD website

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GHSA-5PQQ-993M-XPC4

Vulnerability from github – Published: 2025-10-30 18:31 – Updated: 2025-11-10 15:31
VLAI
Details

Lack of Graceful Error Handling - HTTP 5xx ErrorThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .

Show details on source website

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GHSA-6XGV-XQ79-GP8C

Vulnerability from github – Published: 2022-05-24 17:34 – Updated: 2024-01-23 15:30
VLAI
Details

A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries which trigger an invariant in the IndexBoundsBuilder. This issue affects: MongoDB Inc. MongoDB Server v4.2 versions prior to 4.2.2.

Show details on source website

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GHSA-7FV4-25H2-46HC

Vulnerability from github – Published: 2023-07-13 12:30 – Updated: 2024-04-04 06:07
VLAI
Details

Server information leak of configuration data when an error is generated in response to a specially crafted message.

Show details on source website

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  ]
}

GHSA-7R87-CJ48-WJ45

Vulnerability from github – Published: 2022-04-26 21:19 – Updated: 2024-09-20 21:03
VLAI
Summary
Potential Captcha Validate Bypass in flask-session-captcha
Details

Impact

flask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session.

The captcha.validate() function would return None if passed no value (e.g. by submitting a request with an empty form).

If implementing users were checking the return value to be False, the captcha verification check could be bypassed.

Sample vulnerable code:

if captcha.validate() == False:
    ... # abort
else:
   ... # do stuff

Patches

A new version (1.2.1) is available that fixes the issue.

Workarounds

Users can workaround the issue by not explicitly checking that the value is False.

Checking the return value less explicitly should still work.

if not captcha.validate():
    ... # abort
else:
   ... # do stuff
if captcha.validate():
    ... # do stuff
else:
   ... # abort

References

https://github.com/Tethik/flask-session-captcha/pull/27

For more information

If you have any questions or comments about this advisory: * Open an issue in the github repo

Show details on source website

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "flask-session-captcha"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2022-24880"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-253",
      "CWE-394",
      "CWE-754"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2022-04-26T21:19:52Z",
    "nvd_published_at": "2022-04-25T22:15:00Z",
    "severity": "MODERATE"
  },
  "details": "### Impact\nflask-session-captcha is a package which allows users to extend Flask by adding an image based captcha stored in a server side session.\n\nThe `captcha.validate()` function would return `None` if passed no value (e.g. by submitting a request with an empty form).\n\nIf implementing users were checking the return value to be **False**, the captcha verification check could be bypassed.\n\nSample vulnerable code:\n```python\nif captcha.validate() == False:\n    ... # abort\nelse:\n   ... # do stuff\n```\n\n### Patches\nA new version (1.2.1) is available that fixes the issue.\n\n### Workarounds\nUsers can workaround the issue by not explicitly checking that the value is False. \n\nChecking the return value less explicitly should still work. \n\n```python\nif not captcha.validate():\n    ... # abort\nelse:\n   ... # do stuff\n```\n\n```python\nif captcha.validate():\n    ... # do stuff\nelse:\n   ... # abort\n```\n\n### References\nhttps://github.com/Tethik/flask-session-captcha/pull/27\n\n### For more information\nIf you have any questions or comments about this advisory:\n* Open an issue in [the github repo](https://github.com/Tethik/flask-session-captcha)\n",
  "id": "GHSA-7r87-cj48-wj45",
  "modified": "2024-09-20T21:03:06Z",
  "published": "2022-04-26T21:19:52Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/Tethik/flask-session-captcha/security/advisories/GHSA-7r87-cj48-wj45"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-24880"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Tethik/flask-session-captcha/pull/27"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Tethik/flask-session-captcha/commit/2811ae23a38d33b620fb7a07de8837c6d65c13e4"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/Tethik/flask-session-captcha"
    },
    {
      "type": "WEB",
      "url": "https://github.com/Tethik/flask-session-captcha/releases/tag/v1.2.1"
    },
    {
      "type": "WEB",
      "url": "https://github.com/pypa/advisory-database/tree/main/vulns/flask-session-captcha/PYSEC-2022-193.yaml"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Potential Captcha Validate Bypass in flask-session-captcha"
}

GHSA-G6MR-MVF4-4WVJ

Vulnerability from github – Published: 2022-05-24 17:34 – Updated: 2024-01-23 15:30
VLAI
Details

A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries with compound indexes affecting QueryPlanner. This issue affects: MongoDB Inc. MongoDB Server v3.6 versions prior to 3.6.9, v4.0 versions prior to 4.0.3.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2018-20802"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-394"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2020-11-23T16:15:00Z",
    "severity": "MODERATE"
  },
  "details": "A user authorized to perform database queries may trigger denial of service by issuing specially crafted queries with compound indexes affecting QueryPlanner. This issue affects: MongoDB Inc. MongoDB Server v3.6 versions prior to 3.6.9, v4.0 versions prior to 4.0.3.",
  "id": "GHSA-g6mr-mvf4-4wvj",
  "modified": "2024-01-23T15:30:55Z",
  "published": "2022-05-24T17:34:47Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2018-20802"
    },
    {
      "type": "WEB",
      "url": "https://jira.mongodb.org/browse/SERVER-36993"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

GHSA-G88Q-58F2-QH8W

Vulnerability from github – Published: 2025-10-30 18:31 – Updated: 2025-11-10 15:31
VLAI
Details

Systemic Internal Server Errors - HTTP 500 ResponseThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2025-12515"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-394"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-10-30T16:15:34Z",
    "severity": "CRITICAL"
  },
  "details": "Systemic Internal Server Errors - HTTP 500 ResponseThis issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5 .",
  "id": "GHSA-g88q-58f2-qh8w",
  "modified": "2025-11-10T15:31:03Z",
  "published": "2025-10-30T18:31:08Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-12515"
    },
    {
      "type": "WEB",
      "url": "https://azure-access.com/security-advisories"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/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"
    }
  ]
}

No mitigation information available for this CWE.

No CAPEC attack patterns related to this CWE.