CVE-2023-43866Public exploitNetwork attack vector

Router crash via unbounded curtime stack write

Published Sep 28, 2023 · Updated Sep 23, 2024

Stack buffer overflow in D-Link DIR-619L B1 firmware 2.02 allows remote attackers to crash the router via a crafted curtime parameter. The formSetWAN_Wizard7 handler obtains curtime with websGetVar and passes it to sprintf for storage on the stack without restricting its length. No authentication or user interaction is required, and public evidence bounds the demonstrated consequence to denial of service.

CVSS severity7.5
High
EPSS probability0.83%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stack buffer overflow in D-Link DIR-619L B1 firmware 2.02 allows remote attackers to crash the router via a crafted curtime parameter. The formSetWAN_Wizard7 handler obtains curtime with websGetVar and passes it to sprintf for storage on the stack without restricting its length. No authentication or user interaction is required, and public evidence bounds the demonstrated consequence to denial of service.

The record

CVE
CVE-2023-43866
Published
Sep 28, 2023
Updated
Sep 23, 2024
Vendor
D-Link Corporation
Product
DIR-619L
Classifications
CWE-787, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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=b1-2.02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link Corporation · DIR-619Lversion=b1-2.02

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-787Out-of-bounds Write
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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