Security readout for executives and security teams
Plain-English summary
Older Telegram clients could mishandle a specially crafted animated sticker and read memory outside the intended heap buffer. For executives, the concern is exposure through everyday messaging content on unmanaged or outdated devices, not a confirmed breach or known active campaign.
Executive priority
Handle as a moderate legacy client risk. Prioritize remediation where Telegram is used on corporate devices, by executives, or in high-risk regions, but do not treat it as actively exploited based on the provided evidence.
Technical view
CVE-2021-31322 is a heap buffer overflow in LOTGradient::populate in Telegram's custom rlottie fork. A remote attacker might trigger out-of-bounds heap memory access through a malicious animated sticker on Telegram Android before 7.1.0 (2090), iOS before 7.1, and macOS before 7.1.
Likely exposure
Exposure is limited to users running the affected older Telegram Android, iOS, or macOS versions. Modern clients are likely outside the named affected ranges, but the source bundle does not provide deployment telemetry or asset counts.
Exploitation context
The sources describe a remote attack surface via malicious animated stickers, but do not state confirmed exploitation. CISA KEV status is false in the provided bundle, so active exploitation should not be assumed.
Researcher notes
The useful technical lead is the LOTGradient::populate heap overflow in Telegram's custom rlottie fork. The source bundle does not include CVSS, CWE mapping, exploit maturity, or a vendor advisory with detailed fix notes.
Mitigation direction
- Inventory Telegram versions on managed Android, iOS, and macOS devices.
- Update Telegram clients below the named affected versions to current vendor-supported releases.
- Check Telegram or app-store guidance for any platform-specific remediation notes.
- Restrict or remove outdated Telegram use on managed corporate devices where feasible.
Validation and detection
- Confirm no managed Android client is below 7.1.0 build 2090.
- Confirm no managed iOS or macOS client is below 7.1.
- Review MDM or endpoint inventory for unmanaged legacy Telegram installations.
- Document any users or business processes that require Telegram access.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-31322 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Unknown
- CVSS
- Not scored
- Known Exploited
- No
- Published
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS and timeline data
No CVSS vectors or timeline events were available in the normalized CVE source material.
Source materials
- CVE List V5 sourceCVE List V5
- https://www.shielder.it/blog/2021/02/hunting-for-bugs-in-telegrams-animated-stickers-remote-attack-surface/CVE reference · x_refsource_MISC
- https://www.shielder.it/advisories/telegram-rlottie-lotgradient-populate-heap-buffer-overflow/CVE reference · x_refsource_MISC
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.