CVE-2023-37758Public exploitNetwork attack vector

Unauthenticated service interruption via captcha.cgi buffer overflow

Published Jul 18, 2023 · Updated Oct 28, 2024

Buffer overflow in /web/captcha.cgi in D-Link DIR-815 1.01 allows remote attackers to interrupt the router service via crafted requests. The published record identifies the CGI endpoint but does not disclose which request field is copied, the destination buffer, or the unchecked copy operation. No authentication or user interaction is required; published scoring supports availability loss only, not data access or modification.

CVSS severity7.5
High
EPSS probability1.42%
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 /web/captcha.cgi in D-Link DIR-815 1.01 allows remote attackers to interrupt the router service via crafted requests. The published record identifies the CGI endpoint but does not disclose which request field is copied, the destination buffer, or the unchecked copy operation. No authentication or user interaction is required; published scoring supports availability loss only, not data access or modification.

The record

CVE
CVE-2023-37758
Published
Jul 18, 2023
Updated
Oct 28, 2024
Vendor
D-Link
Product
DIR-815
Classifications
CWE-120, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 18, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1.01

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link · DIR-815version=1.01

Published CVSS scores

7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/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-120Buffer Copy without Checking Size of Input ('Classic Buffer Overflow')
T1499.004Endpoint Denial of Service: Application or System Exploitation

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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