Common Weakness Enumeration

CWE-205

Allowed

Observable Behavioral Discrepancy

Abstraction: Base · Status: Incomplete

The product's behaviors indicate important differences that may be observed by unauthorized actors in a way that reveals (1) its internal state or decision process, or (2) differences from other products with equivalent functionality.

6 vulnerabilities reference this CWE, most recent first.

CVE-2026-109125 (GCVE-0-2026-109125)

Vulnerability from cvelistv5 – Published: 2026-10-21 08:56 – Updated: 2026-10-21 08:56
VLAI
Title
Possible cache poisoning vulnerability via a cache side-channel exposed by 'unwanted-reply-threshold'
Summary
In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be exposed with 'unwanted-reply-threshold > 0' configurations (not a default configuration). If a response-like UDP datagram reaches the upstream source port currently used by a recursive query, but its TXID does not match any pending query, Unbound counts the packet as an unwanted reply. When the accumulated count reaches the configured threshold, Unbound clears the worker's RRset cache and message cache. This cache clear action does not destroy the current upstream UDP pending query. Therefore, an external observer can distinguish whether a candidate port matches the current upstream source port by checking whether an existing cached item has been cleared. This is a cache side-channel vulnerability that can be used to probe the upstream source port. Although the attack is not feasible on default configurations and the suggested value (10 million) makes it an ureliable attack on a public resolver, in scenarios where the attacker can keep a concurrent query window alive, the attacker can first filter the source port and then perform birthday-style guessing against the TXID, making cache poisoning a feasible attack path.
CWE
  • CWE-205 - Observable Behavioral Discrepancy
Assigner
CNA scorecard B 82/100 over 73 records in the last 180 days details
References
Impacted products
Vendor Product Version
NLnet Labs Unbound Affected: 0 , < 1.26.2 (semver)
Create a notification for this product.
Date Public
2026-10-21 00:00
Show details on NVD website

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CVE-2024-6129 (GCVE-0-2024-6129)

Vulnerability from cvelistv5 – Published: 2024-06-18 21:00 – Updated: 2024-08-19 18:08
VLAI
Title
spa-cartcms Username login observable behavioral discrepancy
Summary
A vulnerability, which was classified as problematic, was found in spa-cartcms 1.9.0.6. Affected is an unknown function of the file /login of the component Username Handler. The manipulation of the argument email leads to observable behavioral discrepancy. It is possible to launch the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-268896.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-08-19 18:03 UTC
CWE
  • CWE-205 - Observable Behavioral Discrepancy
Assigner
VulDB CNA under the mitre root
CNA scorecard B 83/100 over 3873 records in the last 180 days details
References
Impacted products
Vendor Product Version
n/a spa-cartcms Affected: 1.9.0.6
spa-cart spa-cart Affected: 1.9.0.6
    cpe:2.3:a:spa-cart:spa-cart:1.9.0.6:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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CVE-2017-11155 (GCVE-0-2017-11155)

Vulnerability from cvelistv5 – Published: 2017-08-08 15:00 – Updated: 2024-09-17 00:46
VLAI
Summary
An information exposure vulnerability in index.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to obtain sensitive system information via unspecified vectors.
Severity
No CVSS data available.
CWE
  • CWE-205 - Information Exposure Through Behavioral Discrepancy (CWE-205)
Assigner
synology CNA under the mitre root
CNA scorecard C 67/100 over 46 records in the last 180 days details
References
Impacted products
Vendor Product Version
Synology Synology Photo Station Affected: before 6.7.3-3432 and 6.3-2967
Create a notification for this product.
Date Public
2017-07-31 00:00
Show details on NVD website

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GHSA-66RC-377G-M4M4

Vulnerability from github – Published: 2026-10-21 09:30 – Updated: 2026-10-21 09:30
VLAI
Details

In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be exposed with 'unwanted-reply-threshold > 0' configurations (not a default configuration). If a response-like UDP datagram reaches the upstream source port currently used by a recursive query, but its TXID does not match any pending query, Unbound counts the packet as an unwanted reply. When the accumulated count reaches the configured threshold, Unbound clears the worker's RRset cache and message cache. This cache clear action does not destroy the current upstream UDP pending query. Therefore, an external observer can distinguish whether a candidate port matches the current upstream source port by checking whether an existing cached item has been cleared. This is a cache side-channel vulnerability that can be used to probe the upstream source port. Although the attack is not feasible on default configurations and the suggested value (10 million) makes it an ureliable attack on a public resolver, in scenarios where the attacker can keep a concurrent query window alive, the attacker can first filter the source port and then perform birthday-style guessing against the TXID, making cache poisoning a feasible attack path.

Show details on source website

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  "modified": "2026-10-21T09:30:30Z",
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GHSA-84MH-M38Q-M9VH

Vulnerability from github – Published: 2024-06-18 21:30 – Updated: 2024-11-18 16:26
VLAI
Details

A vulnerability, which was classified as problematic, was found in spa-cartcms 1.9.0.6. Affected is an unknown function of the file /login of the component Username Handler. The manipulation of the argument email leads to observable behavioral discrepancy. It is possible to launch the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-268896.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2024-6129"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-203",
      "CWE-205"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2024-06-18T21:15:57Z",
    "severity": "MODERATE"
  },
  "details": "A vulnerability, which was classified as problematic, was found in spa-cartcms 1.9.0.6. Affected is an unknown function of the file /login of the component Username Handler. The manipulation of the argument email leads to observable behavioral discrepancy. It is possible to launch the attack remotely. The complexity of an attack is rather high. The exploitability is told to be difficult. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-268896.",
  "id": "GHSA-84mh-m38q-m9vh",
  "modified": "2024-11-18T16:26:45Z",
  "published": "2024-06-18T21:30:36Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2024-6129"
    },
    {
      "type": "WEB",
      "url": "https://msecureltd.blogspot.com/2024/04/friday-fun-pentest-series-5-spa.html"
    },
    {
      "type": "WEB",
      "url": "https://seclists.org/fulldisclosure/2024/Jun/6"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?ctiid.268896"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/?id.268896"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/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"
    }
  ]
}

GHSA-8VH4-8CP7-H627

Vulnerability from github – Published: 2022-05-13 01:38 – Updated: 2025-04-20 03:42
VLAI
Details

An information exposure vulnerability in index.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to obtain sensitive system information via unspecified vectors.

Show details on source website

{
  "affected": [],
  "aliases": [
    "CVE-2017-11155"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-200",
      "CWE-205"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2017-08-08T15:29:00Z",
    "severity": "HIGH"
  },
  "details": "An information exposure vulnerability in index.php in Synology Photo Station before 6.7.3-3432 and 6.3-2967 allows remote attackers to obtain sensitive system information via unspecified vectors.",
  "id": "GHSA-8vh4-8cp7-h627",
  "modified": "2025-04-20T03:42:42Z",
  "published": "2022-05-13T01:38:17Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2017-11155"
    },
    {
      "type": "WEB",
      "url": "https://www.exploit-db.com/exploits/42434"
    },
    {
      "type": "WEB",
      "url": "https://www.synology.com/en-global/support/security/Synology_SA_17_34_PhotoStation"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ]
}

No mitigation information available for this CWE.

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.