CWE-203
AllowedObservable Discrepancy
Abstraction: Base · Status: Incomplete
The product behaves differently or sends different responses under different circumstances in a way that is observable to an unauthorized actor.
903 vulnerabilities reference this CWE, most recent first.
GHSA-379H-2H4C-F6GR
Vulnerability from github – Published: 2022-08-12 00:01 – Updated: 2022-08-14 00:00In LocaleManager, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-225881167
{
"affected": [],
"aliases": [
"CVE-2022-20251"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2022-08-11T15:15:00Z",
"severity": "LOW"
},
"details": "In LocaleManager, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-13Android ID: A-225881167",
"id": "GHSA-379h-2h4c-f6gr",
"modified": "2022-08-14T00:00:21Z",
"published": "2022-08-12T00:01:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2022-20251"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/android-13"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-37GV-W6H3-7HM7
Vulnerability from github – Published: 2025-09-05 18:31 – Updated: 2026-05-12 15:31In the Linux kernel, the following vulnerability has been resolved:
ipv6: sr: Fix MAC comparison to be constant-time
To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.
{
"affected": [],
"aliases": [
"CVE-2025-39702"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-09-05T18:15:47Z",
"severity": "HIGH"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant time.\nUse the appropriate helper function for this.",
"id": "GHSA-37gv-w6h3-7hm7",
"modified": "2026-05-12T15:31:04Z",
"published": "2025-09-05T18:31:27Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-39702"
},
{
"type": "WEB",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/ff55a452d56490047f5233cc48c5d933f8586884"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-38VR-4P57-8H9G
Vulnerability from github – Published: 2022-05-24 17:30 – Updated: 2026-08-19 15:31When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox < 80 and Firefox for Android < 80.
{
"affected": [],
"aliases": [
"CVE-2020-12400"
],
"database_specific": {
"cwe_ids": [
"CWE-200",
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2020-10-08T14:15:00Z",
"severity": "MODERATE"
},
"details": "When converting coordinates from projective to affine, the modular inversion was not performed in constant time, resulting in a possible timing-based side channel attack. This vulnerability affects Firefox \u003c 80 and Firefox for Android \u003c 80.",
"id": "GHSA-38vr-4p57-8h9g",
"modified": "2026-08-19T15:31:50Z",
"published": "2022-05-24T17:30:17Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2020-12400"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1623116"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2023/02/msg00021.html"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2020-36"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2020-39"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-38XM-2FMF-66PQ
Vulnerability from github – Published: 2021-12-16 00:01 – Updated: 2021-12-18 00:01In hasManageOngoingCallsPermission of TelecomServiceImpl.java, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12Android ID: A-194105812
{
"affected": [],
"aliases": [
"CVE-2021-0989"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2021-12-15T19:15:00Z",
"severity": "LOW"
},
"details": "In hasManageOngoingCallsPermission of TelecomServiceImpl.java, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.Product: AndroidVersions: Android-12Android ID: A-194105812",
"id": "GHSA-38xm-2fmf-66pq",
"modified": "2021-12-18T00:01:24Z",
"published": "2021-12-16T00:01:08Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2021-0989"
},
{
"type": "WEB",
"url": "https://source.android.com/security/bulletin/pixel/2021-12-01"
}
],
"schema_version": "1.4.0",
"severity": []
}
GHSA-3C62-7RW6-RHQP
Vulnerability from github – Published: 2022-05-24 16:53 – Updated: 2024-03-21 03:33** DISPUTED ** On BC Vault devices, a side channel for the row-based SSD1309 OLED display was found. The power consumption of each row-based display cycle depends on the number of illuminated pixels, allowing a partial recovery of display contents. For example, a hardware implant in the USB cable might be able to leverage this behavior to recover a data value. In other words, the side channel is relevant only if the attacker has enough control over the device's USB connection to make power-consumption measurements at a time when secret data is displayed. The side channel is not relevant in other circumstances, such as a stolen device that is not currently displaying secret data. NOTE: the vendor's position is that there is no security impact: the only potentially leaked information is the number of characters in the PIN.
{
"affected": [],
"aliases": [
"CVE-2019-14359"
],
"database_specific": {
"cwe_ids": [
"CWE-200",
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-08-12T23:15:00Z",
"severity": "LOW"
},
"details": "** DISPUTED ** On BC Vault devices, a side channel for the row-based SSD1309 OLED display was found. The power consumption of each row-based display cycle depends on the number of illuminated pixels, allowing a partial recovery of display contents. For example, a hardware implant in the USB cable might be able to leverage this behavior to recover a data value. In other words, the side channel is relevant only if the attacker has enough control over the device\u0027s USB connection to make power-consumption measurements at a time when secret data is displayed. The side channel is not relevant in other circumstances, such as a stolen device that is not currently displaying secret data. NOTE: the vendor\u0027s position is that there is no security impact: the only potentially leaked information is the number of characters in the PIN.",
"id": "GHSA-3c62-7rw6-rhqp",
"modified": "2024-03-21T03:33:41Z",
"published": "2022-05-24T16:53:09Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2019-14359"
},
{
"type": "WEB",
"url": "https://bc-vault.com/2019/08/our-response-to-cve-2019-14359"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.0/AV:P/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-3C72-CVWM-9GQX
Vulnerability from github – Published: 2026-07-29 18:31 – Updated: 2026-07-29 18:31Xlight FTP Server before 3.9.5 contains an information disclosure vulnerability that allows unauthenticated attackers to obtain the server's current GetTickCount() value by sending a USER command with a username ending in the :adm suffix. Attackers can trigger the admin protocol path within the standard FTP listener pre-authentication to leak timing information from the FTP 331 response without requiring a separate port or configuration change.
{
"affected": [],
"aliases": [
"CVE-2026-67193"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-07-29T16:17:57Z",
"severity": "MODERATE"
},
"details": "Xlight FTP Server before 3.9.5 contains an information disclosure vulnerability that allows unauthenticated attackers to obtain the server\u0027s current GetTickCount() value by sending a USER command with a username ending in the :adm suffix. Attackers can trigger the admin protocol path within the standard FTP listener pre-authentication to leak timing information from the FTP 331 response without requiring a separate port or configuration change.",
"id": "GHSA-3c72-cvwm-9gqx",
"modified": "2026-07-29T18:31:38Z",
"published": "2026-07-29T18:31:38Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-67193"
},
{
"type": "WEB",
"url": "https://www.vulncheck.com/advisories/xlight-ftp-server-information-disclosure-via-user-command"
},
{
"type": "WEB",
"url": "https://www.xlightftpd.com/whatsnew.htm"
}
],
"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"
}
]
}
GHSA-3C9J-R976-X5VF
Vulnerability from github – Published: 2023-10-30 18:30 – Updated: 2023-11-07 03:30In InputMethod, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.
{
"affected": [],
"aliases": [
"CVE-2023-21337"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-10-30T17:15:49Z",
"severity": "HIGH"
},
"details": "In InputMethod, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local escalation of privilege with no additional execution privileges needed. User interaction is not needed for exploitation.",
"id": "GHSA-3c9j-r976-x5vf",
"modified": "2023-11-07T03:30:25Z",
"published": "2023-10-30T18:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-21337"
},
{
"type": "WEB",
"url": "https://source.android.com/docs/security/bulletin/android-14"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"type": "CVSS_V3"
}
]
}
GHSA-3CCV-3J4F-926Q
Vulnerability from github – Published: 2022-05-24 17:02 – Updated: 2024-04-04 02:41The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitive information by leveraging timing differences when accessing a pre-computed table during modular exponentiation, related to a "Last-Level Cache Side-Channel Attack."
{
"affected": [],
"aliases": [
"CVE-2015-0837"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2019-11-29T22:15:00Z",
"severity": "MODERATE"
},
"details": "The mpi_powm function in Libgcrypt before 1.6.3 and GnuPG before 1.4.19 allows attackers to obtain sensitive information by leveraging timing differences when accessing a pre-computed table during modular exponentiation, related to a \"Last-Level Cache Side-Channel Attack.\"",
"id": "GHSA-3ccv-3j4f-926q",
"modified": "2024-04-04T02:41:20Z",
"published": "2022-05-24T17:02:21Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2015-0837"
},
{
"type": "WEB",
"url": "https://ieeexplore.ieee.org/document/7163050"
},
{
"type": "WEB",
"url": "https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000363.html"
},
{
"type": "WEB",
"url": "https://lists.gnupg.org/pipermail/gnupg-announce/2015q1/000364.html"
},
{
"type": "WEB",
"url": "http://www.debian.org/security/2015/dsa-3184"
},
{
"type": "WEB",
"url": "http://www.debian.org/security/2015/dsa-3185"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N",
"type": "CVSS_V3"
}
]
}
GHSA-3CW5-74J7-6Q4R
Vulnerability from github – Published: 2023-10-25 18:32 – Updated: 2023-11-01 21:30Using iterative requests an attacker was able to learn the size of an opaque response, as well as the contents of a server-supplied Vary header. This vulnerability affects Firefox < 119.
{
"affected": [],
"aliases": [
"CVE-2023-5722"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-10-25T18:17:44Z",
"severity": "MODERATE"
},
"details": "Using iterative requests an attacker was able to learn the size of an opaque response, as well as the contents of a server-supplied Vary header. This vulnerability affects Firefox \u003c 119.",
"id": "GHSA-3cw5-74j7-6q4r",
"modified": "2023-11-01T21:30:18Z",
"published": "2023-10-25T18:32:26Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-5722"
},
{
"type": "WEB",
"url": "https://bugzilla.mozilla.org/show_bug.cgi?id=1738426"
},
{
"type": "WEB",
"url": "https://security.gentoo.org/glsa/202401-10"
},
{
"type": "WEB",
"url": "https://www.mozilla.org/security/advisories/mfsa2023-45"
}
],
"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"
}
]
}
GHSA-3FHX-C744-VPWC
Vulnerability from github – Published: 2023-10-30 18:30 – Updated: 2023-11-03 21:30In Window Manager, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.
{
"affected": [],
"aliases": [
"CVE-2023-21348"
],
"database_specific": {
"cwe_ids": [
"CWE-203"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2023-10-30T17:15:51Z",
"severity": "LOW"
},
"details": "In Window Manager, there is a possible way to determine whether an app is installed, without query permissions, due to side channel information disclosure. This could lead to local information disclosure with no additional execution privileges needed. User interaction is not needed for exploitation.",
"id": "GHSA-3fhx-c744-vpwc",
"modified": "2023-11-03T21:30:24Z",
"published": "2023-10-30T18:30:25Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2023-21348"
},
{
"type": "WEB",
"url": "https://source.android.com/docs/security/bulletin/android-14"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N",
"type": "CVSS_V3"
}
]
}
Mitigation MIT-46
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
- 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-189: Black Box Reverse Engineering
An adversary discovers the structure, function, and composition of a type of computer software through black box analysis techniques. 'Black Box' methods involve interacting with the software indirectly, in the absence of direct access to the executable object. Such analysis typically involves interacting with the software at the boundaries of where the software interfaces with a larger execution environment, such as input-output vectors, libraries, or APIs. Black Box Reverse Engineering also refers to gathering physical side effects of a hardware device, such as electromagnetic radiation or sounds.