CVE-2021-34563

Session-cookie exposure via missing HttpOnly attribute

Published Aug 31, 2021 · Updated Sep 17, 2024

Sensitive cookie exposure in Pepperl+Fuchs WirelessHART-Gateway 3.0.8 and 3.0.9 allows attackers to read cookie values through JavaScript. The gateway's web application issues a cookie without the HttpOnly attribute, leaving its value readable or writable by client-side JavaScript. Exploitation requires user interaction and JavaScript execution in a gateway user's browser, exposing or changing that browser-side cookie.

CVSS severity3.3
Low
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sensitive cookie exposure in Pepperl+Fuchs WirelessHART-Gateway 3.0.8 and 3.0.9 allows attackers to read cookie values through JavaScript. The gateway's web application issues a cookie without the HttpOnly attribute, leaving its value readable or writable by client-side JavaScript. Exploitation requires user interaction and JavaScript execution in a gateway user's browser, exposing or changing that browser-side cookie.

The record

CVE
CVE-2021-34563
Published
Aug 31, 2021
Updated
Sep 17, 2024
Vendor
Pepperl+Fuchs
Product
WHA-GW-F2D2-0-AS-Z2-ETH.EIP
Classifications
CWE-1004, T1539
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 31, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.0.8
  2. Affected versionversion=3.0.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Pepperl+Fuchs · WHA-GW-F2D2-0-AS-Z2-ETH.EIPversion=3.0.8; version=3.0.9
Pepperl+Fuchs · WHA-GW-F2D2-0-AS-Z2-ETHversion=3.0.8; version=3.0.9

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:P/I:N/A:N
3.3NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
3.3CERT VDECVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1004Sensitive Cookie Without 'HttpOnly' Flag
T1539Steal Web Session Cookie

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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