CVE-2018-15839: D-Link DIR-615 devices have a buffer overflow via a long Authorization HTTP header.

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CRITICAL 9.8REMOTEMITIGATE

CVE-2018-15839 is a critical-severity flaw (CVSS 9.8) affecting dir-615 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

D-Link DIR-615 devices have a buffer overflow via a long Authorization HTTP header.

Why this priority

Critical severity
EPSS top 1%: very likely to be exploited
Public exploit reference
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	44.9% (top 1%)
CISA exploited list	No
Weakness	CWE-119
Published	2018-08-28
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

2018-08-28 17:29 UTCPublished CVE record published
2026-06-17 01:43 UTCUpdated Record last modified

dlink dir-615 firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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 · fuse-sshfs · FIXED · 3.7.6-3.eln159 · FEDORA-2026-bcb7be7c5c · source

sudo dnf upgrade --advisory=FEDORA-2026-bcb7be7c5c

Fedora 46 · python-odata-query · FIXED · 0.10.1-1.fc46 · FEDORA-2026-eab44dc513 · source

sudo dnf upgrade --advisory=FEDORA-2026-eab44dc513

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: www.exploit-db.com/exploits/45317/
Exploit-DB: D-Link DIR-615 - Denial of Service (PoC)

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-2018-15839?

dir-615 firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-15839 being exploited?

CVE-2018-15839 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-2018-15839 affect?

CVE-2018-15839 affects dir-615 firmware. Severity is critical (CVSS 9.8). D-Link DIR-615 devices have a buffer overflow via a long Authorization HTTP header.

How urgent is CVE-2018-15839?

Priority 69/100. Critical severity; EPSS top 1%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Software pages

D-Link vulnerabilities

Related CVEs

CVE-2021-42627 CRITICAL 9.8 MITIGATE MITIGATE The WAN configuration page "wan.htm" on D-Link DIR-615 devices with firmware 20.06 can be accessed directly wi
CVE-2026-2152 HIGH 7.2 MITIGATE A vulnerability was found in D-Link DIR-615 4.10
CVE-2026-2151 HIGH 7.2 MITIGATE A vulnerability has been found in D-Link DIR-615 4.10
CVE-2026-1506 HIGH 7.2 MITIGATE A vulnerability was determined in D-Link DIR-615 4.10
CVE-2026-1505 HIGH 7.2 MITIGATE A vulnerability was found in D-Link DIR-615 4.10

References

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