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Full vulnerability report · 2026
CVE-2025-15517High confidence

Authorization Bypass in HTTP Server Endpoints on TP-Link Archer NX200, NX210, NX500 and NX600

TP-Link Systems Inc. · Archer NX600 v3.0

8.6HighCVSS 4.0
Recommended action
Within 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
R
Operational reassessment

Published severity in operational context

Open reassessment dashboard →
Published severityHighOperational priority:High, unchanged from published severity.unchanged

Evidence used

  • No CISA KEV confirmation is currently recorded.
  • EPSS is 2.97% for the current model date.

Compensating controls

  • Validate the affected product branch and deploy the verified fixed release.
  • Restrict local access and enforce least privilege on affected hosts.
  • Monitor vendor guidance and exploitation sources for a material change.

Verification

  1. Confirm that the asset runs TP-Link Systems Inc. Archer NX600 v3.0 and falls inside the recorded affected range.
  2. Verify the installed build against the product-specific fixed version after deployment.
  3. Validate exposure, authentication requirements and compensating controls in the actual environment.
  4. Reopen this reassessment when CVSS, KEV, EPSS, exploit evidence or remediation changes.
Mitigation target: Within 30 daysRemediation target: Within 180 days

This automated reassessment organises public evidence. It does not know asset exposure, business impact or control effectiveness and does not replace CVSS or a human risk decision.

Optional official sources

National CERT insights
?CERT means Computer Emergency Response Team; CSIRT is the closely related term Computer Security Incident Response Team.

Choose official national sources for this report. Each advisory shows its original language. Your selection is remembered on this device and included in shared links.

Official European source

ENISA European Vulnerability Database

Official EUVD identifiers, advisory evidence and known-exploited context. Missing fields are not treated as evidence of low risk.

1 current
ENISA EUVD identifier

EUVD-2025-208937

No EUVD known-exploited evidence

ENISA has published the identifier mapping but no EUVD description has been stored yet.

EUVD state
Present in the current official mapping
Known exploitation
Not present in the current ENISA EUVD known-exploited dataset. This is not proof of no exploitation.
ENISA score
Not supplied in the stored EUVD record
Advisory evidence
No linked advisory details stored yet
Recommended actionWithin 7 days

High technical severity; prioritise exposed affected systems while verifying vendor guidance.

Patch available
01

What, why and how

A missing authentication check in the HTTP server on TP-Link Archer NX200, NX210, NX500 and NX600 to certain cgi endpoints allows unauthenticated access intended for authenticated users. An attacker may perform privileged HTTP actions without authentication, including firmware upload and configuration operations.

What

A missing authentication check in the HTTP server on TP-Link Archer NX200, NX210, NX500 and NX600 to certain cgi endpoints allows unauthenticated access intended for authenticated users. An attacker may perform privileged HTTP actions without authentication, including firmware upload and configuration operations.

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through an adjacent network may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

What

A missing authentication check in the HTTP server on TP-Link Archer NX200, NX210, NX500 and NX600 to certain cgi endpoints allows unauthenticated access intended for authenticated users. An attacker may perform privileged HTTP actions without authentication, including firmware upload and configuration operations.

Why

A security-sensitive function is reachable without the authentication check that should protect it.

How

An attacker operating through an adjacent network may attempt exploitation without authentication or user interaction. If successful, the issue may cause the confidentiality, integrity or availability impact described by the vendor.

02

Exploit reality and attack path

CVSS severity, EPSS forecast probability, public exploit material and CISA-confirmed exploitation are separate signals.

Observed exploitation
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
No confirmed evidence

No CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.

Public PoC / exploit material
?Confirmed exploitation and public exploit material are separate signals. Attacks can occur without public proof-of-concept or exploit code.
None recorded

No exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.

Likely attack path
an adjacent network → Missing Authentication for Critical Function → cause the confidentiality, integrity or availability impact described by the vendor
Attack surface
Adjacent
Privileges required
None: unauthenticated exploitation is possible
User interaction
None
Attack complexity
Low: no specialised conditions are recorded
Security boundary
Not a CVSS 4.0 base metric
Weakness
?CWE means Common Weakness Enumeration: a standard category for the underlying weakness.
CWE-306 ↗

CWE-306: Missing Authentication for Critical Function. The product does not perform any authentication for functionality that requires a provable user identity or consumes a significant amount of resources.

CVSS vector
?CVSS means Common Vulnerability Scoring System. The vector records the metric values used to calculate technical severity.
CVSS:4.0/AV:A/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Common Vulnerability Scoring System 4.0: the compact vector below is decoded into plain language.

AVAdjacentAttack vector: The attacker must be on an adjacent or logically close network.ACLowAttack complexity: No specialised conditions are required beyond attacker-controlled input.ATNoneAttack requirements: No additional deployment or execution condition is required.PRNonePrivileges required: The attacker does not need an account or existing privileges.UINoneUser interaction: No action by another user is required.VCHighVulnerable-system confidentiality: A successful attack can cause a major loss.VIHighVulnerable-system integrity: A successful attack can cause a major loss.VANoneVulnerable-system availability: No direct loss is represented by this metric.SCNoneSubsequent-system confidentiality: No direct loss is represented by this metric.SINoneSubsequent-system integrity: No direct loss is represented by this metric.SANoneSubsequent-system availability: No direct loss is represented by this metric.
Post-exploitation / living off the land
No specific living-off-the-land technique is confirmed in the structured sources. Monitor normal administration tools for activity inconsistent with the affected service's baseline.
UnauthenticatedCWE-306
A

Official authority intelligence

Only matched European and national findings are included. Language selectors and unavailable sources are omitted.

Cyber Security Agency of Singapore · English · CSA-SB-20260325Security Bulletin 25 Mar 2026

The Cyber Security Agency of Singapore included this CVE in its official Security Bulletin 25 Mar 2026, published on 25 March 2026. Open the linked bulletin for the product, severity and reference information published in that issue.

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-009715TP-LINK TechnologiesのArcher NX200 Firmware等の複数製品における重要な機能に対する認証の欠如に関する脆弱性

TP-Link Archer NX200、NX210、NX500、およびNX600のHTTPサーバーにある特定のcgiエンドポイントに対して認証チェックが欠如しているため、本来認証ユーザー向けに意図されたアクセスが認証されていない状態で可能となります。攻撃者は認証なしで特権HTTP操作を実行でき、その操作にはファームウェアのアップロードや設定操作が含まれます。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-009714TP-LINK TechnologiesのArcher NX200 Firmware等の複数製品におけるOS コマンドインジェクションの脆弱性

TP-Link Archer NX200、NX210、NX500、およびNX600のワイヤレス制御管理CLIコマンドに不適切な入力処理の脆弱性が存在します。この脆弱性により、細工された入力がオペレーティングシステムのコマンドの一部として実行される可能性があります。管理者権限を持つ認証済みの攻撃者はオペレーティングシステム上で任意のコマンドを実行でき、これによりデバイスの機密性、完全性、および可用性が影響を受ける可能性があります。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-009713TP-LINK TechnologiesのArcher NX200 Firmware等の複数製品におけるOS コマンドインジェクションの脆弱性

TP-Link Archer NX200、NX210、NX500、および NX600 のモデム管理用管理者CLIコマンドにおける不適切な入力処理により、細工された入力がオペレーティングシステムのコマンドの一部として実行される可能性があります。認証された管理者権限を持つ攻撃者は、オペレーティングシステム上で任意のコマンドを実行でき、その結果、デバイスの機密性、完全性、および可用性に影響を及ぼす恐れがあります。

Official advisory ↗
JVN iPedia · Japanese · JVNDB-2026-009711TP-LINK TechnologiesのArcher NX200 Firmware等の複数製品における複数の脆弱性

TP-Link Archer NX200、NX210、NX500、NX600の構成メカニズム内にハードコードされた暗号鍵により、デバイスの構成データを復号および再暗号化できます。認証された攻撃者は構成ファイルを復号化し、内容を変更して再暗号化できるため、デバイス構成データの機密性および完全性に影響を与える可能性があります。

Official advisory ↗
KISA KrCERT/CC · Korean · KNVD-6738TP-Link 제품 보안 업데이트 권고

TP-Link Archer NX200, NX210, NX500, NX600에서 발생하는 Missing Authentication for Critical Function 취약점(CVE-2025-15517) [5]

Official advisory ↗
03

Patch and workaround

Operational remediation based on structured source evidence.

Status
?Patch availability is based on structured fixed-version fields and authoritative update references. If no fix is verified, check the vendor advisory before making a change.
Patch available
Affected
Fixed
An authoritative update reference is available, but the fixed version is not recorded in the structured CVE fields. Check the linked vendor advisory for the applicable release.
Action
Review the linked authoritative reference and apply the recorded fixed release appropriate to the affected product branch.
Workaround
No verified workaround is recorded. Limit untrusted access and use least privilege until authoritative guidance is available.
04

Evidence and provenance

Published 23 Mar 2026 · Last source change 24 Mar 2026, 03:56 UTC · CWE-306 · Missing Authentication for Critical Function

CVE recordCVE.org · 5.2
CVSS sourceCNA
EPSS source
?The date BlackTree first stored a score for this CVE from the daily FIRST EPSS feed.
FIRST · tracked since 2026-08-14
European sourceENISA EUVD · EUVD-2025-208937
Product sourceCNA
Remediation sourceCVE/CNA references
CWE sourceCNA
NVD statusNVD enriched

Core structured fields are present and their contributing authorities are shown above.

Material change intelligence

What changed after publication

View recent updates ↗

No material field changes have been recorded since change tracking began. Routine source refreshes and cosmetic edits are intentionally excluded.

Material fields only · duplicate refreshes suppressed · history retained for the configured operational retention period
CVE published
ENISA EUVD · EUVD-2025-208937↗Vendor advisory↗CVE authority or vendor reference↗Official CVE record (CNA and ADP data)↗NVD record↗
Technical terms and abbreviations used in this report
CVE
Common Vulnerabilities and Exposures: the public identifier for one disclosed vulnerability.
CVSS
Common Vulnerability Scoring System: a technical severity framework; it is not patching priority by itself.
EPSS
Exploit Prediction Scoring System: FIRST's estimate of the probability that exploitation activity will be observed in the next 30 days; it is a forecast, not confirmation.
CWE
Common Weakness Enumeration: the standard category describing the underlying software or hardware weakness.
CNA
CVE Numbering Authority: an organisation authorised to assign and publish CVE records.
CISA ADP
Cybersecurity and Infrastructure Security Agency Authorized Data Publisher: structured enrichment added to a CVE record.
NVD
National Vulnerability Database: NIST's enrichment service for CVE records.
CERT / CSIRT
A computer security incident response team that publishes warnings or coordinates incident response.
PoC
Proof of concept: public material that demonstrates or helps reproduce exploitation.
CSAF
Common Security Advisory Framework: a machine-readable format for security advisories.
LoTL
Living off the land: abuse of legitimate tools or system functions during an attack.
Free version - for non-commercial use only.CVE-2025-15517 · cve.blacktree.nl