Buffer overflow in Telegram
CVE-2021-30496
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."
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.012 (66.5th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 66th percentile — 66.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Telegram — versions 7.6.2
Weakness classification (CWE)
Public proof-of-concept exploits
References
- gist.github.com/raminfp/bf64c2974ee6949787329749148a4b31 (Exploit, Third Party Advisory)
- t.me/joinchat/bJ9cnUosVh03ZTI0 (Vendor Advisory)
Frequently asked questions
- What is CVE-2021-30496?
- CVE-2021-30496 is a medium-severity vulnerability in Telegram, classified under Stack-based Buffer Overflow. CVSS score: 5.7/10. Published 2021-04-20.
- How severe is CVE-2021-30496?
- Medium severity. CVSS v3 base score is 5.7 out of 10.
- Is CVE-2021-30496 known to be exploited?
- 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.