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TI-2021-08787 Aliases CVE-2021-27247GHSA-32ww-65cv-cvf4

Out-of-bounds read in Tencent WeChat

Priority LOW 38CWE-125Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Information disclosure
Confidentiality · integrity · availability
High · None · None
Fix status
No fix listed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-125 and the CVSS impact.

Summary

This vulnerability allows remote attackers to disclose sensitive information on affected installations of Tencent WeChat 2.9.5 desktop version. User interaction is required to exploit this vulnerability in that the target must visit a malicious page or open a malicious file. The specific flaw exists within the WXAM decoder. The issue results from the lack of proper validation of user-supplied data, which can result in a read past the end of an allocated buffer. An attacker can leverage this in conjunction with other vulnerabilities to execute arbitrary code in the context of the current process. Was ZDI-CAN-11907.

Why it matters now

EPSS 0.06673 93rd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

VendorProductAffected versionsFixed inStatusSource
TencentWeChat2.9.5 desktop version—No fix listedCNA
  • WeChat VendorTencent Affected 2.9.5 desktop version Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:tencent:wechat:2.9.5:*:*:*:*:-:*:*2.9.5VulnerableTencent
  • cpe:2.3:a:tencent:wechat:2.9.5:*:*:*:*:-:*:* Versions 2.9.5 Vulnerable ·Tencent

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-27247
  2. 2026-10-03 Alias added: GHSA-32ww-65cv-cvf4

References

Advisory 1

  • TI-2024-26921 Insecure Permissions vulnerability in Tencent wechat v.8.0.37 allows an attacker to… CVSS 3.1HIGH 8.8
  • TI-2020-16942 Memory corruption in Tencent WeChat CVSS 3.1HIGH 8.8
  • TI-2021-17359 In the WeChat application 8.0.10 for Android and iOS, a mini program can obtain sensitive… CVSS 3.1HIGH 7.5
  • TI-2019-08535 vcodec2_hls_filter in libvoipCodec_v7a.so in the WeChat application through 7.0.3 for… CVSS 3.1MEDIUM 5.5
  • TI-2019-12800 Open redirect in Tencent WeChat CVSS 3.1MEDIUM 5.4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences