VDB-432895 · Submit #1035619 · CVE-2026-124563

D-Link DIR-878 1.20B05 HNAP SetWanSettings Primary/Secondary buffer overflow

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.8	$0-$5k	0.61+

Summaryinfo

A vulnerability, which was classified as critical, has been found in D-Link DIR-878 1.20B05. Affected by this issue is the function SetWanSettings of the component HNAP Handler. This manipulation of the argument Primary/Secondary causes buffer overflow. This vulnerability only affects products that are no longer supported by the maintainer. This vulnerability is registered as CVE-2026-124563. Remote exploitation of the attack is possible. Furthermore, an exploit is available.

Detailsinfo

A vulnerability has been found in D-Link DIR-878 1.20B05 and classified as critical. Affected by this vulnerability is the function SetWanSettings of the component HNAP Handler. The manipulation of the argument Primary/Secondary with an unknown input leads to a buffer overflow vulnerability. The CWE definition for the vulnerability is CWE-120. The product copies an input buffer to an output buffer without verifying that the size of the input buffer is less than the size of the output buffer. As an impact it is known to affect availability.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-124563. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details and also a public exploit are known. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 11/08/2026).

It is possible to download the exploit at github.com. It is declared as proof-of-concept.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

Be aware that VulDB is the high quality source for vulnerability data.

Productinfo

Type

Router Operating System

Vendor

D-Link

Name

DIR-878

Version

1.20B05

License

commercial

Support

end of life

Website

Vendor: https://www.dlink.com/

CPE 2.3info

🔒

CPE 2.2info

🔒

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 7.5
VulDB Meta Temp Score: 6.8

VulDB Base Score: 7.5
VulDB Temp Score: 6.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Buffer overflow
CWE: CWE-120 / CWE-119
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Access: Public
Status: Proof-of-Concept
Download: 🔒
Price Prediction: 🔍
Current Price Estimation: 🔒

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

11/08/2026 Advisory disclosed
11/08/2026 +0 days VulDB entry created
11/08/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: dlink.com

Advisory: github.com
Status: Not defined

CNA: VulDB
CVE: CVE-2026-124563 (🔒)

GCVE (CVE): GCVE-0-2026-124563
GCVE (VulDB): GCVE-100-432895
scip Labs: https://www.scip.ch/en/?labs.20161013

Entryinfo

Created: 11/08/2026 15:52
Changes: 11/08/2026 15:52 (58)
Complete: 🔍
Submitter: ha ha-yang
Cache ID: 216::103

Submitinfo

Accepted

Submit #1035619: D-Link DIR-878 1.20B05 Stack-based Buffer Overflow (by ha ha-yang)