CVE-2022-32548Public exploitNetwork attack vector

Unauthenticated code execution via login buffer overflow

Published Aug 29, 2022 · Updated Aug 3, 2024

Buffer overflow in DrayTek Vigor router firmware allows remote attackers to execute arbitrary code through the Web UI login page. /cgi-bin/wlogin.cgi applies faulty size verification to Base64-encoded username or password values in the aa and ab POST fields, allowing decoded data to overflow a buffer. The page is reachable on the LAN by default and from the internet when remote management is enabled; failed attempts can reboot the router.

CVSS severity10.0
Critical
EPSS probability33.99%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in DrayTek Vigor router firmware allows remote attackers to execute arbitrary code through the Web UI login page. /cgi-bin/wlogin.cgi applies faulty size verification to Base64-encoded username or password values in the aa and ab POST fields, allowing decoded data to overflow a buffer. The page is reachable on the LAN by default and from the internet when remote management is enabled; failed attempts can reboot the router.

The record

CVE
CVE-2022-32548
Published
Aug 29, 2022
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-120, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 29, 2022CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

10.0MITRECVSS:3.1/AC:L/AV:N/A:H/C:H/I:H/PR:N/S:C/UI:N
9.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1190Exploit Public-Facing Application

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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