CVE-2022-32548
Published: 29 August 2022
Summary
CVE-2022-32548 is a critical-severity Classic Buffer Overflow (CWE-120) vulnerability in Draytek Vigor3910 Firmware. Its CVSS base score is 10.0 (Critical).
Operationally, ranked in the top 1.5% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog; a public proof-of-concept is referenced.
Deeper analysis
CVE-2022-32548 is a buffer overflow vulnerability in the /cgi-bin/wlogin.cgi endpoint on certain DrayTek Vigor routers released before July 2022, including the Vigor3910 prior to firmware 4.3.1.1. The flaw is triggered when processing username or password values supplied to the aa or ab fields and is tracked under CWE-120.
Unauthenticated remote attackers can exploit the issue over the network without user interaction. Successful exploitation yields full system compromise, consistent with the CVSS 3.1 base score of 10.0 that reflects high impact across confidentiality, integrity, and availability in a changed scope.
Public reporting documents active exploitation attempts against exposed DrayTek devices and confirms remote code execution as the practical outcome. The associated EPSS score reached a peak of 0.7053 and currently stands at 0.6557, indicating sustained attacker interest after disclosure. Firmware updates that remove the affected routers from the vulnerable population are the primary mitigation referenced in the available advisories.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2022-35616
Vulnerability details
An issue was discovered on certain DrayTek Vigor routers before July 2022 such as the Vigor3910 before 4.3.1.1. /cgi-bin/wlogin.cgi has a buffer overflow via the username or password to the aa or ab field.
- CWE(s)
Related Threats
No named actor attribution yet. ATT&CK technique mapping in progress for this CVE.
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Platform-independent managed code eliminates the need for unchecked native buffer copies that are the root cause of classic buffer overflows.