CVE-2020-14473Public exploitNetwork attack vector

Unauthenticated memory corruption via undersized CGI buffers

Published Jun 24, 2020 · Updated Aug 4, 2024

Stack-based buffer overflows in DrayTek Vigor3900, Vigor2960, and Vigor300B before 1.5.1.1 allow remote attackers to corrupt memory. One mainfunction.cgi path allocates for the raw url value before escaping expands it, while the login path copies a decoded Basic-authentication username longer than 64 bytes into a 64-byte stack buffer. No authentication is required; the published proofs of concept establish remotely triggered memory corruption, but not code execution or persistent compromise.

CVSS severity9.8
Critical
EPSS probability2.30%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack-based buffer overflows in DrayTek Vigor3900, Vigor2960, and Vigor300B before 1.5.1.1 allow remote attackers to corrupt memory. One mainfunction.cgi path allocates for the raw url value before escaping expands it, while the login path copies a decoded Basic-authentication username longer than 64 bytes into a 64-byte stack buffer. No authentication is required; the published proofs of concept establish remotely triggered memory corruption, but not code execution or persistent compromise.

The record

CVE
CVE-2020-14473
Published
Jun 24, 2020
Updated
Aug 4, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 24, 2020CVE publishedPublication date reported by the CVE source.
  2. Aug 4, 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

7.5NIST NVDAV:N/AC:L/Au:N/C:P/I:P/A:P
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.

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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-787Out-of-bounds Write
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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