CVE-2024-42812: In D-Link DIR-860L v2.03, there is a buffer overflow vulnerability due to the lack of length verification for

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CRITICAL 9.8REMOTEMITIGATE

CVE-2024-42812 is a critical-severity flaw (CVSS 9.8) affecting dir-860l firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In D-Link DIR-860L v2.03, there is a buffer overflow vulnerability due to the lack of length verification for the SID field in gena.cgi. Attackers who successfully exploit this vulnerability can cause the remote target device to crash or execute arbitrary commands.

Why this priority

Critical severity
EPSS top 3%: very likely to be exploited
Public exploit reference
CISA SSVC: automatable with total technical impact
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	15.5% (top 3%)
CISA exploited list	No
Weakness	CWE-120
Published	2024-08-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: dlink

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2024-08-19 20:15 UTCPublished CVE record published
2026-06-17 07:50 UTCUpdated Record last modified

dlink dir-860l firmware MITIGATE

Affected: 2.0.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.0.3

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

A distro patch exists: prefer upgrading over downgrading.

Fedora ELN · gram_grep · FIXED · 0.10.4-1.eln159 · FEDORA-2026-0808475f2a · source

sudo dnf upgrade --advisory=FEDORA-2026-0808475f2a

Fedora 46 · wesnoth · FIXED · 1.19.29-1.fc46 · FEDORA-2026-58f458e24e · source

sudo dnf upgrade --advisory=FEDORA-2026-58f458e24e

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Write-up: gist.github.com/XiaoCurry/574ed9c2b0d12cd0b45399116d82121c
Write-up: www.dlink.com/en/security-bulletin/

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2024-42812?

dir-860l firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2024-42812 being exploited?

CVE-2024-42812 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2024-42812 affect?

CVE-2024-42812 affects dir-860l firmware. Severity is critical (CVSS 9.8). In D-Link DIR-860L v2.03, there is a buffer overflow vulnerability due to the lack of length verification for the SID field in gena.cgi. Attackers who successfully exploit this vulnerability can cause the remote target device to crash or ex

How urgent is CVE-2024-42812?

Priority 72/100. Critical severity; EPSS top 3%: very likely to be exploited; Public exploit reference; CISA SSVC: automatable with total technical impact; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2025-9026 HIGH 7.3 MITIGATE A vulnerability was identified in D-Link DIR-860L 2.04.B04
CVE-2024-41611 CRITICAL 9.8 MITIGATE In D-Link DIR-860L REVA FIRMWARE PATCH 1.10..B04, the Telnet service contains hardcoded credentials, enabling
CVE-2024-37605 MEDIUM 6.5 MITIGATE A NULL pointer dereference in D-Link DIR-860L REVB_FIRMWARE_2.04.B04_ic5b allows attackers to cause a Denial o

References

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