CVE-2020-12516 | WAGO: PLC families 750-88x and 750-352 prone to DoS attack

Older firmware versions (FW1 up to FW10) of the WAGO PLC family 750-88x and 750-352 are vulnerable for a special denial of service attack.

Published: 2020-12-09 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2020-12516 is rated Moderate Risk (58.3/100): CVSS High severity, with medium exploitation likelihood (EPSS 1.86%). EPSS rose +1.49% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2020-12516

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.37% 1.86% +1.49%
2 2025-10-10 0.33% 0.37% +0.04%
3 2025-10-09 — 0.33% —

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2020-12516

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2020-12516

Affected software / configurations for CVE-2020-12516

Vendor Product Version Raw CPE
wago 750-352_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-352_firmware:*:*:*:*:*:*:*:*
wago 750-831_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-831_firmware:*:*:*:*:*:*:*:*
wago 750-852_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-852_firmware:*:*:*:*:*:*:*:*
wago 750-880_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-880_firmware:*:*:*:*:*:*:*:*
wago 750-881_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-881_firmware:*:*:*:*:*:*:*:*
wago 750-889_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-889_firmware:*:*:*:*:*:*:*:*
wago 750-331_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-331_firmware:*:*:*:*:*:*:*:*
wago 750-829_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-829_firmware:*:*:*:*:*:*:*:*
wago 750-882_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-882_firmware:*:*:*:*:*:*:*:*
wago 750-885_firmware >= fw1, <= fw10 cpe:2.3:o:wago:750-885_firmware:*:*:*:*:*:*:*:*

References for CVE-2020-12516

URL Tags
https://cert.vde.com/en-us/advisories/vde-2020-042 Patch Third Party Advisory
https://us-cert.cisa.gov/ics/advisories/icsa-20-308-01 Mitigation Third Party Advisory US Government Resource
cvelogic Threat Intelligence