HOMEVULNERABILITIESCVE-2021-30496
MEDIUM

CVE-2021-30496

NVD-CWE-noinfoPublished: April 20, 2021· Updated: Jun 17, 2026

5.7
CVSS v3.1

Official Description

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."

NVD Source

Technical Analysis

CVE-2021-30496 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

A successful exploit results in availability disruption (denial of service), with a CVSS base score of 5.7.

CVSS v3.1 Vector Breakdown

Exploitability
Attack VectorNetwork
Attack ComplexityLow
Privileges Req.Low
User InteractionRequired
ScopeUnchanged
Impact
ConfidentialityNone
IntegrityNone
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H

Affected Vendors & Products

telegram1 product(s)
telegram
Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time
Exploit-DB
Offensive Security exploit database
GitHub PoC Search
Community PoC repositories
Rapid7 / Metasploit
Metasploit module search
PacketStorm
Security advisories & exploits
NVD Detail
Official NIST entry
MITRE CVE
CVE Program entry
External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31
ADVISORYhttps://t.me/joinchat/bJ9cnUosVh03ZTI0
ADVISORYhttps://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31
ADVISORYhttps://t.me/joinchat/bJ9cnUosVh03ZTI0

All References (4)

→
https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31Exploit · Third Party Advisory
→
https://t.me/joinchat/bJ9cnUosVh03ZTI0Vendor Advisory
→
https://gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31Exploit · Third Party Advisory
→
https://t.me/joinchat/bJ9cnUosVh03ZTI0Vendor Advisory

Quick Facts

CVE IDCVE-2021-30496
CVSS Score5.7 / 10
SeverityMEDIUM
WeaknessNVD-CWE-noinfo
CISA KEVNo
Affected1 vendor(s)
PublishedApr 20, 2021

Related CVEs (NVD-CWE-noinfo)

CVE-2009-1314
10.0
CVE-2013-2333
10.0
CVE-2008-6158
10.0
CVE-2012-3859
10.0
CVE-2012-1774
10.0
CVE-2013-2367
10.0

Recommended Actions

  • →Apply vendor patches immediately
  • →Monitor CVE-2021-30496 in threat intel feeds
  • →Review IDS/IPS signatures for exploitation attempts
Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.
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