CVE-2023-43863Public exploitNetwork attack vector

Router crash via unchecked curtime formatting

Published Sep 28, 2023 · Updated Sep 23, 2024

Stack buffer overflow in D-Link DIR-619L B1 2.02 allows remote attackers to crash the router through a crafted curtime parameter. The formSetWanDhcpplus handler obtains the untrusted curtime value with websGetVar and passes it to sprintf on a stack buffer without enforcing a length limit. Network access to the router's web interface is sufficient, and successful exploitation interrupts routing service rather than exposing or altering data.

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 2.02 allows remote attackers to crash the router through a crafted curtime parameter. The formSetWanDhcpplus handler obtains the untrusted curtime value with websGetVar and passes it to sprintf on a stack buffer without enforcing a length limit. Network access to the router's web interface is sufficient, and successful exploitation interrupts routing service rather than exposing or altering data.

The record

CVE
CVE-2023-43863
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=2.02

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

D-Link Corporation · DIR-619Lversion=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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