Buffer overflow in Telegram
CVE-2021-31320
Telegram Android <7.1.0 (2090), Telegram iOS <7.1, and Telegram macOS <7.1 are affected by a Heap Buffer Overflow in the VGradientCache::generateGradientColorTable function of their custom fork of the rlottie library. A remote attacker might be able to overwrite heap memory out-of-bounds on a victim device via a malicious animated sticker.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.1 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:H.
EPSS exploit prediction
EPSS: 0.012 (68.6th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.6% 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
Weakness classification (CWE)
References
- www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-re… (Exploit, Third Party Advisory)
- www.shielder.it/advisories/telegram-rlottie-vgradientcache-generategradientcolo… (Exploit, Third Party Advisory)
Frequently asked questions
- What is CVE-2021-31320?
- CVE-2021-31320 is a high-severity vulnerability in Telegram, classified under Out-of-bounds Write. CVSS score: 7.1/10. Published 2021-05-18.
- How severe is CVE-2021-31320?
- High severity. CVSS v3 base score is 7.1 out of 10.