What is the CVSS score of CVE-2026-5981?

CVE-2026-5981 has a CVSS 4.0 base score of 7.4 (High). CVSS vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P. EPSS exploitation probability: 0.0%.

Is there a public PoC exploit available for CVE-2026-5981?

Yes, a public proof-of-concept exploit is available for CVE-2026-5981. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate CVE-2026-5981?

Within 24 hours: inventory all DIR-605L 2.13B01 devices across the network and classify by business criticality. Within 7 days: restrict network access to affected devices (disable remote management, segment from critical systems, disable wireless if feasible) and begin replacement procurement. Within 30 days: complete migration to supported hardware; decommission all DIR-605L units regardless of patch availability.

Dir 605L CVE-2026-5981

EUVD-2026-21189 HIGH

Classic Buffer Overflow (CWE-120)

2026-04-09 VulDB

Buffer Overflow D-Link Dir 605L D-Link

7.4

CVSS 4.0 · NVD

View

Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata – not a confirmed exploit chain

Access

Authenticate to DIR-605L web interface
Delivery

Send POST request to /goform/formAdvFirewall
Exploit

Inject oversized curTime parameter
Execution

Trigger buffer overflow in formAdvFirewall function
Impact

Execute arbitrary code on device

Vulnerability Assessment

Weakness	CWE CWE-120 ASVS 5.0 V15 - Secure Coding and Architecture Buffer copy size validation MITRE ATT&CK 1 technique across 1 tactic: Execution The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up. Sign in to read
Exploitation Conditions	D-Link DIR-605L firmware version 2.13B01 or earlier. Attacker requires authenticated access (low-privilege user login) to POST request handler at /goform/formAdvFirewall. Remote exploitation possible; no victim interaction required. Affects end-of-life unsupported products only.
Impact	CVSS 7.4 severity is tempered by requirement for authenticated access (PR:L) and product end-of-life status. Moderate observed exploitation activity. Remote network attack with low complexity. Buffer overflow in firewall configuration function poses confidentiality and integrity risk to affected legacy devices only.
Exploit ScenarioDerived	Authenticated attacker sends POST request to /goform/formAdvFirewall with oversized curTime parameter, triggering stack buffer overflow. Publicly available exploit code exists; execution requires valid credentials.

Monitor Track and reassess. Why: Vendor states no customer action required.

No patch listed yet 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Apr 09, 2026

Buffer overflow in D-Link DIR-605L 2.13B01 wireless router enables remote authenticated attackers to execute arbitrary code via the formAdvFirewall function in POST request handler. Exploitation occurs through manipulation of the curTime parameter in /goform/formAdvFirewall endpoint. Publicly available exploit code exists. This end-of-life product receives no vendor security support, requiring immediate device replacement for affected deployments.

RemediationAI

No vendor-released patch identified at time of analysis. D-Link has discontinued support for DIR-605L hardware, making security updates unavailable. Primary remediation: immediately replace affected DIR-605L devices with currently supported router models from D-Link or alternative vendors. Interim risk reduction for environments unable to replace immediately: disable remote administration interfaces, restrict administrative access to trusted internal networks only via firewall rules, implement network segmentation to isolate vulnerable devices, and monitor for unauthorized configuration changes. Advisory reference: https://vuldb.com/vuln/356535. Technical details: https://lavender-bicycle-a5a.notion.site/D-Link-DIR-605L-formAdvFirewall-33153a41781f80678733f4b12282f3fa. Vendor site: https://www.dlink.com/.

Affected VersionsENISA

DIR-605L 2.13B01

Affected Packages

euvd dir_605l no fix

Source: OSV (Open Source Vulnerabilities)

Affects your stack

Affects 1 package in euvd

Checking this CVE against your own stacks and servers is part of the Basic plan and up.

Technical ContextAI · show details

CWE-120 classic buffer overflow in formAdvFirewall function caused by unchecked curTime parameter length validation. POST request handler fails to enforce boundary checks before copying user-controlled input into fixed-size memory buffer. CVSS vector PR:L indicates authenticated access requirement. Affects DIR-605L firmware 2.13B01 (cpe:2.3:a:d-link:dir-605l).

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Exploit and PoC references, threat intelligence from 22 sources

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Severity by source

NVD PRIMARY 7.4 HIGH

CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:P

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

Attack Vector

Network

Attack Complexity

Low

Attack Requirements

None

Privileges Required

Low

User Interaction

None

Vulnerable system: Confidentiality

High

Vulnerable system: Integrity

High

Vulnerable system: Availability

High

Subsequent system: Confidentiality

None

Subsequent system: Integrity

None

Subsequent system: Availability

None

Lifecycle Timeline

PoC Detected

Apr 09, 2026 - 22:16 vuln.today

Public exploit code

CVE Published

Apr 09, 2026 - 21:15 nvd

HIGH 7.4

DescriptionCVE.org

A vulnerability has been found in D-Link DIR-605L 2.13B01. This affects the function formAdvFirewall of the file /goform/formAdvFirewall of the component POST Request Handler. Such manipulation of the argument curTime leads to buffer overflow. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. This vulnerability only affects products that are no longer supported by the maintainer.

Executive ViewAI

Why It Matters

CVE-2026-5981 is a buffer overflow vulnerability in D-Link DIR-605L routers that allows authenticated attackers to execute arbitrary code remotely. Since the product is end-of-life with no vendor patch forthcoming, organizations still operating this hardware face persistent compromise risk and must prioritize device replacement to restore security posture.

Business Impact: High

Compensating Controls

No vendor-released patch identified at time of analysis. Interim mitigations: (1) Restrict access to /goform/formAdvFirewall endpoint via firewall rules; (2) disable remote administration interfaces; (3) isolate affected devices to separate network segment with egress filtering; (4) enforce strong authentication credentials; (5) monitor for suspicious POST requests to /goform endpoints. However, these controls are temporary-device replacement is mandatory.

Threat Intelligence Overview

EPSS Score

0.0%

Top 86% exploitable

Exploit

POC

Public exploit code exists

Data Quality

7 sources

Confidence: High

EUVD

NVD

CVE.org

EPSS

Vulnrichment CIRCL

VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue

Severity HIGH

CISA KEV No

Public POC Yes

EPSS 0.0%

Patch available No

Active threat No

Deciding rule

Vendor states no customer action required

What every action level means

Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.

Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.

This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.

This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.

Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision

Scheduled

Exploitation

Poc

System Exposure· derived

Open

Automatable

Human Impact

High

Technical Impact

Total

Priority Score

Low Medium High Critical

KEV: 0

EPSS: 0

CVSS: +37

PoC: +20

Weaponized: 0

Threat intel: 0

Gov advisory: 0

Attack Technique

Buffer Overflow HIGH

A buffer overflow occurs when a program writes more data to a memory buffer than it was allocated to hold, causing the excess data to spill into adjacent memory regions.