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TI-2020-16942 Aliases CVE-2020-27874GHSA-6c98-7x6w-rx39

Memory corruption in Tencent WeChat

Priority MEDIUM 42CWE-119Published · Updated

Key facts

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

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-119 and the CVSS impact.

Summary

This vulnerability allows remote attackers to execute arbitrary code on affected installations of Tencent WeChat 7.0.18. 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 memory access past the end of an allocated object. An attacker can leverage this vulnerability to execute code in the context of the current process. Was ZDI-CAN-11580.

Why it matters now

EPSS 0.02178 82nd 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
TencentWeChat7.0.18—No fix listedCNA
  • WeChat VendorTencent Affected 7.0.18 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:tencent:wechat:7.0.18:*:*:*:*:android:*:*7.0.18VulnerableTencent
  • cpe:2.3:a:tencent:wechat:7.0.18:*:*:*:*:android:*:* Versions 7.0.18 Vulnerable ·Tencent

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2020-27874
  2. 2026-10-03 Alias added: GHSA-6c98-7x6w-rx39

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-2021-08787 Out-of-bounds read in Tencent WeChat CVSS 3.1MEDIUM 6.5
  • 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