CVE-2021-30496 - Vulnerability Details - OpenCVE

The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of service (application crash) if the victim pastes an attacker-supplied message (e.g., in the Persian language) into a channel or group. The crash occurs in MtProtoKitFramework. NOTE: the vendor's perspective is that "this behavior can't be considered a vulnerability."

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction Required

No CVSS v3.0

Access Vector Network

Access Complexity Medium

Authentication Single

Confidentiality Impact None

Integrity Impact None

Availability Impact Partial

This CVE is not in the KEV list.

The EPSS score is 0.00661.

Exploitation poc

Automatable no

Technical Impact partial

Vendors	Products
Telegram Subscribe	Telegram Subscribe

Configuration 1 [-]

cpe:2.3:a:telegram:telegram:7.6.2:*:*:*:*:iphone_os:*:*

No data.

No data.

Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References

Link	Providers
https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31
https://t.me/joinchat/bJ9cnUosVh03ZTI0

History

Tue, 24 Feb 2026 18:15:00 +0000

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:telegram:telegram::::::iphone_os::*
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Projects

Sign in to view the affected projects.

MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2021-04-20T00:00:00.000Z

Updated: 2024-08-03T22:32:41.088Z

Reserved: 2021-04-11T00:00:00.000Z

Link: CVE-2021-30496

Vulnrichment

Updated: 2024-08-03T22:32:41.088Z

NVD

Status : Modified

Published: 2021-04-20T16:15:10.590

Modified: 2024-11-21T06:04:02.233

Link: CVE-2021-30496

Redhat

No data.

OpenCVE Enrichment

No data.

Weaknesses

{"dataType": "CVE_RECORD", "dataVersion": "5.1", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2021-30496", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2024-08-03T22:32:41.088Z", "dateReserved": "2021-04-11T00:00:00.000Z", "datePublished": "2021-04-20T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2022-10-14T00:00:00.000Z"}, "descriptions": [{"lang": "en", "value": "The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of service (application crash) if the victim pastes an attacker-supplied message (e.g., in the Persian language) into a channel or group. The crash occurs in MtProtoKitFramework. NOTE: the vendor's perspective is that \"this behavior can't be considered a vulnerability.\""}], "tags": ["disputed"], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31"}, {"url": "https://t.me/joinchat/bJ9cnUosVh03ZTI0"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}, "adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-30496", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-01T14:44:16.196509Z"}}}], "affected": [{"cpes": ["cpe:2.3:a:telegram:telegram:*:*:*:*:*:iphone_os:*:*"], "vendor": "telegram", "product": "telegram", "versions": [{"status": "affected", "version": "7.6.2"}], "defaultStatus": "unknown"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-121", "description": "CWE-121 Stack-based Buffer Overflow"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:12:40.657Z"}}, {"providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T22:32:41.088Z"}, "title": "CVE Program Container", "references": [{"url": "https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31", "tags": ["x_transferred"]}, {"url": "https://t.me/joinchat/bJ9cnUosVh03ZTI0", "tags": ["x_transferred"]}]}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CVE Program Container", "references": [{"url": "https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31", "tags": ["x_transferred"]}, {"url": "https://t.me/joinchat/bJ9cnUosVh03ZTI0", "tags": ["x_transferred"]}], "providerMetadata": {"orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T22:32:41.088Z"}}, {"metrics": [{"cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 5.7, "attackVector": "NETWORK", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE"}}, {"other": {"type": "ssvc", "content": {"id": "CVE-2021-30496", "role": "CISA Coordinator", "options": [{"Exploitation": "poc"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2024-05-01T14:44:16.196509Z"}}}], "affected": [{"cpes": ["cpe:2.3:a:telegram:telegram:*:*:*:*:*:iphone_os:*:*"], "vendor": "telegram", "product": "telegram", "versions": [{"status": "affected", "version": "7.6.2"}], "defaultStatus": "unknown"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-121", "description": "CWE-121 Stack-based Buffer Overflow"}]}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-05-01T14:44:50.554Z"}, "title": "CISA ADP Vulnrichment"}], "cna": {"tags": ["disputed"], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "references": [{"url": "https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31"}, {"url": "https://t.me/joinchat/bJ9cnUosVh03ZTI0"}], "descriptions": [{"lang": "en", "value": "The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of service (application crash) if the victim pastes an attacker-supplied message (e.g., in the Persian language) into a channel or group. The crash occurs in MtProtoKitFramework. NOTE: the vendor's perspective is that \"this behavior can't be considered a vulnerability.\""}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "text", "description": "n/a"}]}], "providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2022-10-14T00:00:00.000Z"}}}, "cveMetadata": {"cveId": "CVE-2021-30496", "state": "PUBLISHED", "dateUpdated": "2024-08-03T22:32:41.088Z", "dateReserved": "2021-04-11T00:00:00.000Z", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "datePublished": "2021-04-20T00:00:00.000Z", "assignerShortName": "mitre"}, "dataVersion": "5.1"}

{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:telegram:telegram:7.6.2:*:*:*:*:iphone_os:*:*", "matchCriteriaId": "69719CA8-ED11-463E-A7A8-68FA44F859ED", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [{"sourceIdentifier": "cve@mitre.org", "tags": ["disputed"]}], "descriptions": [{"lang": "en", "value": "The Telegram app 7.6.2 for iOS allows remote authenticated users to cause a denial of service (application crash) if the victim pastes an attacker-supplied message (e.g., in the Persian language) into a channel or group. The crash occurs in MtProtoKitFramework. NOTE: the vendor's perspective is that \"this behavior can't be considered a vulnerability.\""}, {"lang": "es", "value": "** EN DISPUTA ** La aplicaci\u00f3n Telegram versi\u00f3n 7.6.2 para iOS, permite a usuarios autenticados remoto causar una denegaci\u00f3n de servicio (bloqueo de la aplicaci\u00f3n) si la v\u00edctima pega un mensaje proporcionado por el atacante (por ejemplo, en el idioma Persian) en un canal o grupo. El bloqueo ocurre en la funci\u00f3n MtProtoKitFramework. NOTA: la perspectiva del proveedor es que \"este comportamiento no puede considerarse una vulnerabilidad\""}], "id": "CVE-2021-30496", "lastModified": "2024-11-21T06:04:02.233", "metrics": {"cvssMetricV2": [{"acInsufInfo": false, "baseSeverity": "LOW", "cvssData": {"accessComplexity": "MEDIUM", "accessVector": "NETWORK", "authentication": "SINGLE", "availabilityImpact": "PARTIAL", "baseScore": 3.5, "confidentialityImpact": "NONE", "integrityImpact": "NONE", "vectorString": "AV:N/AC:M/Au:S/C:N/I:N/A:P", "version": "2.0"}, "exploitabilityScore": 6.8, "impactScore": 2.9, "obtainAllPrivilege": false, "obtainOtherPrivilege": false, "obtainUserPrivilege": false, "source": "nvd@nist.gov", "type": "Primary", "userInteractionRequired": true}], "cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 5.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "REQUIRED", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 2.1, "impactScore": 3.6, "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}, "published": "2021-04-20T16:15:10.590", "references": [{"source": "cve@mitre.org", "tags": ["Exploit", "Third Party Advisory"], "url": "https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31"}, {"source": "cve@mitre.org", "tags": ["Vendor Advisory"], "url": "https://t.me/joinchat/bJ9cnUosVh03ZTI0"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Exploit", "Third Party Advisory"], "url": "https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Vendor Advisory"], "url": "https://t.me/joinchat/bJ9cnUosVh03ZTI0"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "NVD-CWE-noinfo"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-121"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}