VDB-173314 · CVE-2021-30496 · GCVE-0-2021-30496

Telegram App 7.6.2 on iOS MtProtoKitFramework denial of service ⚔ [Disputed]

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
4.9	$0-$5k	0.00

Summaryinfo

A vulnerability categorized as problematic has been discovered in Telegram App 7.6.2 on iOS. This impacts an unknown function of the component MtProtoKitFramework. Executing a manipulation can lead to denial of service. The identification of this vulnerability is CVE-2021-30496. The attack may be launched remotely. Furthermore, there is an exploit available. The actual existence of this vulnerability is currently in question.

Detailsinfo

A vulnerability classified as problematic was found in Telegram App 7.6.2 on iOS (iOS App Software). This vulnerability affects an unknown functionality of the component MtProtoKitFramework. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. CVE summarizes:

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."

The weakness was shared 04/22/2021. The advisory is available at gist.github.com. This vulnerability was named CVE-2021-30496. Successful exploitation requires user interaction by the victim. Technical details are unknown but a public exploit is available. This vulnerability is assigned to T1499 by the MITRE ATT&CK project.

It is possible to download the exploit at t.me. It is declared as proof-of-concept. The real existence of this vulnerability is still doubted at the moment.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

iOS App Software

Vendor

Name

Version

7.6.2

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.0
VulDB Meta Temp Score: 4.9

VulDB Base Score: 3.5
VulDB Temp Score: 3.2
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.7
NVD Vector: 🔍

CNA Base Score: 5.7
CNA Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

NVD Base Score: 🔍

Exploitinginfo

Class: Denial of service
CWE: CWE-404
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Access: Public
Status: Proof-of-Concept
Download: 🔍

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔍

Timelineinfo

04/11/2021 🔍
04/22/2021 +11 days 🔍
04/22/2021 +0 days 🔍
05/03/2025 +1472 days 🔍

Sourcesinfo

Advisory: gist.github.com
Status: Not defined
Disputed: 🔍

CVE: CVE-2021-30496 (🔍)
GCVE (CVE): GCVE-0-2021-30496
GCVE (VulDB): GCVE-100-173314
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 04/22/2021 13:09
Updated: 05/03/2025 23:55
Changes: 04/22/2021 13:09 (41), 04/24/2021 07:44 (2), 04/28/2021 09:44 (18), 06/05/2024 10:30 (18), 08/04/2024 02:25 (14), 05/03/2025 23:55 (6)
Complete: 🔍
Cache ID: 216::103