PT-2021-20562 · Wago · Wago 750-881+3

Uwe Disch · Published 2021-08-31 · Updated 2021-09-09 · CVE-2021-34581

Positive Technologies (AI Summary)

CVSS v2.0

7.8

High

Base vector

AV:N/AC:L/Au:N/C:N/I:N/A:C

Name of the Vulnerable Software and Affected Versions: WAGO 750-831/xxx-xxx versions FW4 through FW15 WAGO 750-880/xxx-xxx versions FW4 through FW15 WAGO 750-881 versions FW4 through FW15 WAGO 750-889 versions FW4 through FW15

Description: The issue is related to a Missing Release of Resource after Effective Lifetime vulnerability in the OpenSSL implementation. This allows an unauthenticated attacker to cause a Denial of Service (DoS) on the device.

Recommendations: For WAGO 750-831/xxx-xxx versions FW4 through FW15, update to a version later than FW15 to resolve the issue. For WAGO 750-880/xxx-xxx versions FW4 through FW15, update to a version later than FW15 to resolve the issue. For WAGO 750-881 versions FW4 through FW15, update to a version later than FW15 to resolve the issue. For WAGO 750-889 versions FW4 through FW15, update to a version later than FW15 to resolve the issue. As a temporary workaround, consider restricting access to the device to minimize the risk of exploitation.

Fix

Missing Release of Resource after Effective Lifetime

Weakness Enumeration

CWE-772

Related Identifiers

CVE-2021-34581

Affected Products

Wago 750-831

Wago 750-880

Wago 750-881

Wago 750-889

References · 5

• https://osv.dev/vulnerability/CVE-2021-34581 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-34581 · Security Note
• https://cert.vde.com/en-us/advisories/vde-2021-038 · Note
• https://t.me/cibsecurity/28074 · Telegram Post
• https://t.me/cvenotify/20428 · Telegram Post