CVE-2026-34473
Published: 06 May 2026
Summary
CVE-2026-34473 is a high-severity Uncontrolled Resource Consumption (CWE-400) vulnerability in Com (inferred from references). Its CVSS base score is 7.5 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Application or System Exploitation (T1499.004); ranked in the top 16.9% of CVEs by exploit likelihood; it is not currently listed in the CISA KEV catalog.
Deeper analysis
CVE-2026-34473 is an unauthenticated denial-of-service vulnerability affecting the web management interface of multiple ZTE router models including the H8102E, H168N, H167A, H199A, H288A, H198A, H267A, H267N, H268A, H388X, H196A, H369A, H268N, H208N, H367N, H181A, and H196Q. The flaw, tracked under CWE-400, allows a remote attacker to send an oversized application/x-www-form-urlencoded POST body that renders the interface unresponsive until the device is rebooted; the issue has been observed in firmware versions prior to 2022, though the vendor states devices shipped after March 2021 are not affected and operator firmware may differ. The vulnerability carries a CVSS 3.1 base score of 7.5.
An attacker with network access to the router's web interface can trigger the condition without authentication or user interaction, resulting in loss of availability for the management plane while leaving other device functions potentially intact.
Vendor statements and public disclosures indicate that firmware released after 23 March 2021 addresses the issue for affected hardware; operators are advised to verify and apply the latest firmware images available from ZTE, as custom builds may retain the exposure. The referenced advisories and the vendor site provide the primary sources for obtaining updated images.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-27881
Vulnerability details
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.…
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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.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Oversized POST triggers resource exhaustion DoS on the web management interface (CWE-400), directly enabling application exploitation for denial of service.
CVEs Like This One
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
Limiting concurrent sessions directly prevents uncontrolled resource consumption by capping the number of active sessions per user or account.
Analysis identifies uncontrolled resource consumption indicative of denial-of-service or abuse attempts.
Contingency plan testing includes resource exhaustion scenarios to verify recovery, making it harder for attackers to sustain exploits that cause uncontrolled consumption.
Updated contingency plans include current procedures to detect, contain, and recover from resource exhaustion, limiting an attacker's ability to sustain impact from uncontrolled consumption.
Alternate site allows resumption of operations if resource exhaustion at the primary site is exploited to cause unavailability.
Alternate telecommunications services enable resumption of essential functions when primary services become unavailable due to uncontrolled resource consumption.
The team can analyze and respond to resource exhaustion incidents, reducing the impact of attacks that exploit uncontrolled consumption weaknesses.
Timely maintenance support and spare parts enable rapid recovery from failures induced by uncontrolled resource consumption, shortening the impact window of denial-of-service attacks.