CVE-2020-13559

mediumpriority · track · 30EPSS 0.013 · 71 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.33% (71st) EPSS

CVSS 5 · medium

Is it mine?

2 products

Check your exposure

Who says so?

3 sources

cnnvd · enisa_euvd · nvd

EPSS · scored 2026-10-27

A denial-of-service vulnerability exists in the traffic-logging functionality of FreyrSCADA IEC-60879-5-104 Server Simulator 21.04.028. A specially crafted packet can lead to denial of service. An attacker can send a malicious packet to trigger this vulnerability.

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:N/I:N/A:Pprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · ENISA EU

v3.05.9mediumCVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:Hsecondary · talos-cna@cisco.com USexploitability 2.2 · impact 3.6

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-697USprimaryCWE-1024US

affected products (2)

Products and version ranges known to be affected.

n/a FreyrSCADA≤ IEC-60879-5-104 Server Simulator 21.04.028enisa_euvdEU
freyrscada iec-60879-5-104 server simulator= 21.04.028nvdUScpe:2.3:a:freyrscada:iec-60879-5-104_server_simulator:*:*:*:*:*:*:*:*

also known as (4)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd nvd NVD CVE.org MITRE

published 2021-01-11modified 2026-06-17

related (221)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2024-5217US	critical9.8OT critical	99.6% (100th)	KEV	2024-07-10
ServiceNow has addressed an input validation vulnerability that was identified in the Washington DC, Vancouver, and earlier Now Platform releases. This vulnerability could enable a…
CVE-2020-5849US	high7.5OT critical	93.2% (100th)	KEV	2020-03-16
Unraid 6.8.0 allows authentication bypass.
CVE-2020-8864US	high8.8	81.7% (100th)	—	2020-03-23
This vulnerability allows network-adjacent attackers to bypass authentication on affected installations of D-Link DIR-867, DIR-878, and DIR-882 routers with firmware 1.10B04. Authe…
CVE-2023-32571US	critical9.8	34.9% (98th)	Exploit	2023-06-22
Dynamic Linq 1.0.7.10 through 1.2.25 before 1.3.0 allows attackers to execute arbitrary code and commands when untrusted input to methods including Where, Select, OrderBy is parsed…
CVE-2019-10071US	critical9.8	8.75% (95th)	—	2019-09-16
The code which checks HMAC in form submissions used String.equals() for comparisons, which results in a timing side channel for the comparison of the HMAC signatures. This could le…

+216 more

references (5)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan