CVE intelligence and bounded remediation

CVE-2021-34559 — Pepperl-Fuchs Wha-Gw-F2D2-0-As-Z2-Eth Firmware security vulnerability

Medium CVSS 5.4

In PEPPERL+FUCHS WirelessHART-Gateway <= 3.0.8 a vulnerability may allow remote attackers to rewrite links and URLs in cached pages to arbitrary strings.

Severity
Medium
CVSS
5.4 (3.1)
Published
2021-08-31
CISA KEV
Not currently listed
Ecosystem
operating-system
Weaknesses
CWE-444

Affected products

  • pepperl-fuchs / wha-gw-f2d2-0-as-z2-eth_firmware
  • pepperl-fuchs / wha-gw-f2d2-0-as-z2-eth.eip_firmware

Matched remediation archetype

HTTP request smuggling and message-boundary ambiguity

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Check exposure

  • Inventory every proxy, CDN, gateway, load balancer, service mesh, and application server hop on affected request paths.
  • Compare documented parsing and normalization behavior for message length, transfer coding, duplicate headers, and protocol translation.
  • Identify connection reuse and which downstream services trust headers added by intermediaries.

Remediate safely

  • Update affected intermediaries and origin servers and align them on a single standards-compliant request framing policy.
  • Reject ambiguous length, transfer-coding, duplicate, malformed, and unsupported framing before forwarding.
  • Normalize or remove hop-by-hop and identity headers at one controlled boundary and add multi-hop regression tests.

Authoritative sources

Complete CVE record and remediation plan

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