What is the CVSS score of EUVD-2026-27881?

EUVD-2026-27881 has a CVSS 3.1 base score of 7.5 (High). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. EPSS exploitation probability: 0.0%.

Which versions of ZTE Home Routers are affected by EUVD-2026-27881?

CVE-2026-34473 is a high-severity denial-of-service vulnerability affecting ZTE home routers across 17 models that allows remote attackers to crash the web management interface and require manual…

Is there a public PoC exploit available for EUVD-2026-27881?

Yes, a public proof-of-concept exploit is available for EUVD-2026-27881. Prioritise patching immediately. EPSS: 0.0%.

How to fix or mitigate EUVD-2026-27881?

Within 24 hours: Identify all ZTE router models (H8102E, H168N, H167A, and 15 others) in production using network inventory tools; document firmware versions and current operator patches. Within 7 days: Contact your ISP or device operator to confirm available firmware versions for your specific models and deployment date; implement network-level access controls restricting HTTP POST requests to the management interface to trusted administrative subnets only. Within 30 days: Deploy confirmed patched firmware versions as provided by your carrier (ZTE claims patches available since March 2021, but verify with operator); establish automated monitoring for management interface availability and unexpected reboots; test failover procedures for affected devices.

ZTE Home Routers EUVD-2026-27881

| CVE-2026-34473 HIGH

Uncontrolled Resource Consumption (CWE-400)

2026-05-06 mitre

Denial Of Service Zte

7.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

7.5 HIGH

AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Lifecycle Timeline

Analysis Generated

May 06, 2026 - 22:00 vuln.today

CVSS changed

May 06, 2026 - 20:22 NVD

7.5 (HIGH)

CVE Published

May 06, 2026 - 00:00 nvd

HIGH 7.5

DescriptionCVE.org

Unauthenticated DoS in ZTE H8102E, H168N, H167A, H199A, H288A, H198A, H267A, H267N, H268A, H388X, H196A, H369A, H268N, H208N, H367N, H181A, and H196Q. A denial-of-service condition can be triggered against the router's web interface by sending an oversized application/x-www-form-urlencoded POST body. After triggering, the management interface may become unresponsive until the device is rebooted. This may affect any firmware version prior to 2022 (reporter observation). The supplier stated that devices are not vulnerable since 2021-03-23; operator firmware may vary.

AnalysisAI

Remote denial-of-service in ZTE home routers (H8102E, H168N, H167A, and 15 other models) allows unauthenticated network attackers to crash the web management interface via oversized HTTP POST request with application/x-www-form-urlencoded content, requiring physical device reboot to restore service. ZTE claims devices patched since March 2021, but operator firmware timelines vary. EPSS data not available; no active exploitation confirmed (not in CISA KEV). Publicly available exploit details exist via GitHub gist.

Technical ContextAI

This vulnerability exploits improper input validation (CWE-400: Uncontrolled Resource Consumption) in the HTTP POST request handler of ZTE home router web interfaces. The affected routers fail to validate or limit the size of application/x-www-form-urlencoded POST bodies before attempting to parse them, leading to resource exhaustion that crashes the management service. This affects at least 18 ZTE residential gateway models (H8102E, H168N, H167A, H199A, H288A, H198A, H267A, H267N, H268A, H388X, H196A, H369A, H268N, H208N, H367N, H181A, H196Q). The vulnerability exists in the web server component that handles administrative interface requests, which runs on standard HTTP/HTTPS ports (typically 80/443 or 8080). CPE data shows n/a placeholders, indicating incomplete product enumeration in NVD - specific model CPEs are not formally registered.

RemediationAI

Upgrade affected ZTE router firmware to versions released after 2021-03-23 per ZTE's statement to the reporter. Contact your internet service provider to request firmware updates, as these devices are typically ISP-managed and may not receive automatic updates. If ISP cannot confirm patch status or provide updated firmware, implement network-level compensating controls: restrict access to the router management interface by disabling remote administration features (WAN-side access to HTTP/HTTPS ports), configure firewall rules to permit management access only from trusted LAN IP addresses, or place the router behind a properly configured edge firewall that rate-limits HTTP POST requests. Note that disabling remote management prevents ISP remote support capabilities. As a temporary mitigation during active attacks, power-cycle the device to restore management interface availability, though this does not prevent re-exploitation. Organizations using these models in managed service environments should prioritize replacement with enterprise-grade equipment that receives regular security updates.