High Memory corruption

CVE-2026-8619 — Unauthenticated Denial-of-Service Vulnerability in HTTP Service in TP-Link TL-MR100, TL-MR150, TL-MR6400 and Archer MR600

An unauthenticated denial-of-service vulnerability was identified in TP-Link TL-MR100 v3.2, TL-MR150 v3.2, TL-MR6400 v8.0 and Archer MR600 v2, due to improper handling of exceptional request conditions that may lead to a NULL pointer dereference. A remote attacker on an adjacent network can send a specially crated HTTP request to trigger a crash of the HTTP service process. Successful exploitation may cause the HTTP service to crash, making the web management interface and HTTP-dependent functionality temporarily unavailable.

Published Aug 19, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: TPLink

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

Technical severity (high)+6

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

—

No EPSS score.

Affects

TP-Link Systems Inc.

Archer Mr600 Firmware and 7 more

CVSS base

7.5

High · 3 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation

None

none · proof-of-concept · active

Automatable

can an attacker script the kill-chain steps

Technical impact

Partial

partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (TP-Link Systems Inc. Archer Mr600 Firmware, TP-Link Systems Inc. Archer MR600 v2, TP-Link Systems Inc. Tl-mr100 Firmware…).
The attack is network-based and needs no privileges: restrict exposure (ACLs, VPN, WAF) until patched.
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes matching the vulnerability class (memory corruption), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
TP-Link Systems Inc.	Archer Mr600 Firmware	< 1.10.0	Vulnerable	NIST National Vulnerability Database
TP-Link Systems Inc.	Archer MR600 v2	< Archer MR600(EU)_V2_1.10.0 Build 260618	Vulnerable	CVE Program (cve.org) e CISA ADP
TP-Link Systems Inc.	Tl-mr100 Firmware	< 1.3.0	Vulnerable	NIST National Vulnerability Database
TP-Link Systems Inc.	TL-MR100 v3.2	< TL-MR100(EU)_V3.20_1.3.0 Build 260609 Rel.49957n	Vulnerable	CVE Program (cve.org) e CISA ADP
TP-Link Systems Inc.	Tl-mr150 Firmware	< 1.3.0	Vulnerable	NIST National Vulnerability Database
TP-Link Systems Inc.	TL-MR150 v.3.2	< TL-MR150(EU)_V3.20_1.3.0 Build 260720 Rel.59727n	Vulnerable	CVE Program (cve.org) e CISA ADP
TP-Link Systems Inc.	Tl-mr6400 Firmware	< 1.5.0	Vulnerable	NIST National Vulnerability Database
TP-Link Systems Inc.	TL-MR6400 v8.0	< TL-MR6400(EN)_V8_1.5.0 Build 260610 Rel.67978n	Vulnerable	CVE Program (cve.org) e CISA ADP

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector

Network

Attack complexity

Low

Privileges required

None

User interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

Score	Version	Severity	Expl.	Impact	Scored by
7.1	CVSS 4.0	High	—	—	f23511db-6c3e-4e32-a477-6aa17d310630 via NIST National Vulnerability Database
7.1	CVSS 4.0	High	—	—	TPLink via CVE Program (cve.org) e CISA ADP
7.5	CVSS 3.1	High	3.9	3.6	nvd@nist.gov via NIST National Vulnerability Database

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H (score shown at the top: nvd@nist.gov)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-476 · NULL Pointer Dereference

Other CVEs with this weakness →

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Prioritize edge telemetry for the network-reachable component (proxy, WAF, IDS/IPS).
Correlate service crashes/restarts with inbound traffic; repeated crashes may indicate attempts.

web/proxy/WAF logsnetwork IDS/IPSendpoint telemetry (EDR)crash dumps

Timeline

What happened to this CVE, newest first.

2026
Affected products added · tp-link systems inc./tl-mr100 v3.2, tp-link systems inc./tl-mr150 v.3.2, tp-link systems inc./tl-mr6400 v8.0, tp-link sy
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
SSVC assessment updated
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Record published
Oct 15, 2026
CVSS changed · 7.5
Oct 15, 2026 · NIST National Vulnerability Database
Source status changed · → Analyzed
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 19, 2026 · TPLink

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

5 on the record

www.tp-link.com/us/support/faq/5253/
Vendor Advisory, vendor-advisory, NIST National Vulnerability Database
www.tp-link.com/en/support/download/tl-mr150/v3.20/
Product, patch, NIST National Vulnerability Database
www.tp-link.com/en/support/download/archer-mr600/v2/
Product, patch, NIST National Vulnerability Database
www.tp-link.com/en/support/download/tl-mr100/v3.20/
Product, patch, NIST National Vulnerability Database
www.tp-link.com/en/support/download/tl-mr6400/v8/
Product, patch, NIST National Vulnerability Database

Elsewhere on this site

TP-Link Systems Inc.
every CVE for this vendor

Memory corruption
same class

CWE-476
other pages naming this weakness

Related CVEs (same products)

Medium CVE-2026-12339 Authenticated Arbitrary File Write Vulnerability in multiple devices Aug 10, 2026
High CVE-2026-3841 Command Injection Vulnerability in Telnet CLI on TP-Link TL-MR6400 Mar 12, 2026
High CVE-2025-14756 Authenticated Command Injection Vulnerability in Archer MR600 Jan 26, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No FIRST EPSS score.
No fixed version, patch or mitigation documented.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-8619 is "Unauthenticated Denial-of-Service Vulnerability in HTTP Service in TP-Link TL-MR100, TL-MR150, TL-MR6400 and Archer MR600", rated High. It affects Archer Mr600 Firmware (TP-Link Systems Inc.); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 7.5 describes technical severity. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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