CVE-2021-33485

highpriority · track · 39EPSS 0.011 · 66 %ileDEEURUUS
grimoire priorityP2 · Scheduled
Exploitable?
—
no known exploitation
Likely / severe?
1.14% (66th) EPSS
CVSS 7.5 · high
Is it mine?
52 products
Check your exposure
Who says so?
6 sources
cnnvd · enisa_euvd · fstec_bdu · cisa_csaf_ot

EPSS · scored 2026-10-22

CODESYS Control Runtime system before 3.5.17.10 has a Heap-based Buffer Overflow.

01

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

No vendor fix yet; a mitigation is available.

  • MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.0festo_psirt

    Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.

  • MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.5.16.10festo_psirt

    Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.

  • Mitigationwago_psirt

    • We recommend all effected users of the PFC 100 & PFC 200 product family to update to firmware version 03.10.08(22) or later. • We recommend all effected users of the TP600 and CC100 product family to update to firmware version 03.10.09(22) or later. • The affected products of the CC100 family will receive a patched Version approximately in 09/22. In addition to the mitigation hints concerning the above-mentioned vulnerabilities CODESYS GmbH recommends the following general defense measures to reduce the risk of exploits: - Use controllers and devices only in a protected environment to minimize network exposure and ensure that they are not accessible from outside - Use firewalls to protect and separate the control system network from other networks - Use VPN (Virtual Private Networks) tunnels if remote access is required - Activate and apply user management and password features - Use encrypted communication links - Limit the access to both development and control system by physical means, operating system features, etc. - Protect both development and control system by using up to date virus detecting solutions For further impact information and risk mitigation, please refer to the official CODESYS Advisory Website at https://www.codesys.com/security/security-reports.html

  • MitigationFesto Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-D (All versions)cisa_csaf_ot

    (CVE-2020-12068, CVE-2022-22515, CVE-2022-22514, CVE-2022-22513, CVE-2021-36763, CVE-2021-33485, CVE-2020-10245, CVE-2020-15806, CVE-2019-9011, CVE-2019-9013, CVE-2020-12067, CVE-2020-12069, CVE-2021-36764, CVE-2019-5105, CVE-2021-29241, CVE-2021-29242, CVE-2022-22519, CVE-2022-22517, CVE-2018-0739) (Product Group: Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-D(All versions), Festo Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-LK(All versions), Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-S(All versions)): No fix planned. This issue will be handled with next hardware generation release.

  • MitigationFesto Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-S (All versions)cisa_csaf_ot

    (CVE-2020-12068, CVE-2022-22515, CVE-2022-22514, CVE-2022-22513, CVE-2021-36763, CVE-2021-33485, CVE-2020-10245, CVE-2020-15806, CVE-2019-9011, CVE-2019-9013, CVE-2020-12067, CVE-2020-12069, CVE-2021-36764, CVE-2019-5105, CVE-2021-29241, CVE-2021-29242, CVE-2022-22519, CVE-2022-22517, CVE-2018-0739) (Product Group: Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-D(All versions), Festo Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-LK(All versions), Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-S(All versions)): No fix planned. This issue will be handled with next hardware generation release.

  • MitigationFesto Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-LK (All versions)cisa_csaf_ot

    (CVE-2020-12068, CVE-2022-22515, CVE-2022-22514, CVE-2022-22513, CVE-2021-36763, CVE-2021-33485, CVE-2020-10245, CVE-2020-15806, CVE-2019-9011, CVE-2019-9013, CVE-2020-12067, CVE-2020-12069, CVE-2021-36764, CVE-2019-5105, CVE-2021-29241, CVE-2021-29242, CVE-2022-22519, CVE-2022-22517, CVE-2018-0739) (Product Group: Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-D(All versions), Festo Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-LK(All versions), Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-S(All versions)): No fix planned. This issue will be handled with next hardware generation release.

  • MitigationFesto Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-S (All versions)cisa_csaf_ot

    (CVE-2020-12068, CVE-2022-22515, CVE-2022-22514, CVE-2022-22513, CVE-2021-36763, CVE-2021-33485, CVE-2020-10245, CVE-2020-15806, CVE-2019-9011, CVE-2019-9013, CVE-2020-12067, CVE-2020-12069, CVE-2021-36764, CVE-2019-5105, CVE-2021-29241, CVE-2021-29242, CVE-2022-22519, CVE-2022-22517, CVE-2018-0739) (Product Group: Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-D(All versions), Festo Firmware (R06 (11.10.2016) = 2.3.8.1) installed on Festo Hardware Controller CECC-LK(All versions), Festo Firmware (R05 (17.06.2016) = 2.3.8.0) installed on Festo Hardware Controller CECC-S(All versions)): No fix planned. This issue will be handled with next hardware generation release.

  • MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.0cisa_csaf_ot

    Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.

  • MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.5.16.10cisa_csaf_ot

    Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.

  • No fix plannedfesto_psirt

    For CVE-2019-5105, CVE-2019-9011, CVE-2019-9013, CVE-2020-10245, CVE-2020-12067, CVE-2020-12068, CVE-2020-12069, CVE-2020-15806, CVE-2021-29241, CVE-2021-29242, CVE-2021-33485, CVE-2021-36763, CVE-2021-36764, CVE-2022-22513, CVE-2022-22514, CVE-2022-22515, CVE-2022-22517, CVE-2022-22519: No fix planned. This issue will be handled with next hardware generation release.

  • No fix plannedfesto_psirt

    No fix planned. This issue will be handled with next hardware generation release.

02

cvss

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

9.8
010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · high–critical · 7.5–9.8

v2.07.5highAV:N/AC:L/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 10 · impact 6.4
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 3.9 · impact 5.9
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · CISA US
v3.19.8criticalAV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · ENISA EU
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondaryexploitability 3.9 · impact 5.9
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · WAGO PSIRT DE
v3.19.8criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:Hsecondary · Festo PSIRT DE
v3.19criticalCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:Usecondary · CVSS-BT (t0sche)
03

ssvc

A stakeholder decision — act, attend, or track — from exploitation and impact.

Exploitation: none · Automatable: yes · Technical Impact: totalcoordinatorcisa_ssvcUS
04

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-787USprimaryCWE-122USCWE-122USCWE-787USCWE-787USCWE-787USCWE-787US
05

affected products (52)

Products and version ranges known to be affected.

showing 20 of 52
06

advisories (6)

Vendor and ecosystem advisories describing this.

  • FSA-202202Festo: Controller CECC-S,LK,D family <= 2.3.8.1 - multiple vulnerabilities in CODESYS V3 runtime system2022-07-18csaf · festo_psirtDE

    The Festo controller CECC product family is affected by multiple vulnerabilities in the CODESYS V3 runtime.

  • FSA-202203Festo: Controller CECC-S,LK,D family firmware 2.4.2.0 - multiple vulnerabilities in CODESYS V3 runtime system2022-07-18csaf · festo_psirtDE

    The Festo controller CECC product family in firmware version 2.4.2.0 is affected by multiple vulnerabilities in the CODESYS V3 runtime.

  • FSA-202601Several CODESYS vulnerabilities in Festo Automation Suite2026-02-26csaf · festo_psirtDE

    Starting with Festo Automation Suite (FAS) version 2.8.0.138, the suite is delivered only with a connector to Codesys, rather than including Codesys directly. Prior to this version, Codesys was bundled within the FAS installation. From version 2.8.0.138 onwards, customers are required to download and install Codesys independently. This change impacts the handling of security vulnerabilities (CVEs) related to Codesys. Any Codesys-related security issues must now be addressed by the customer through their separate Codesys installation. The FAS itself includes only the connector component, which is maintained and updated within the suite. Please ensure that Codesys is kept up to date independently to mitigate any potential security risks associated with the Codesys software.

  • VDE-2022-035WAGO: Multiple product series affected by multiple CODESYS vulnerabilities2022-08-17csaf · wago_psirtDE

    Multiple WAGO product families are prone to multiple vulnerabilities affecting CODESYS control runtime system.

  • ICSA-25-273-04Festo Controller CECC-S,-LK,-D Family Firmware (Update A)2025-09-30icsa · cisa_csaf_otUS

    Successful exploitation of these vulnerabilities could allow an attacker to crash services, escalate privileges, bypass authentication, or gain unauthorized access to sensitive systems and data.

  • ICSA-26-076-01CODESYS in Festo Automation Suite2026-02-26icsa · cisa_csaf_otUS

    Starting with Festo Automation Suite (FAS) version 2.8.0.138, the suite is delivered only with a connector to Codesys, rather than including Codesys directly. Prior to this version, Codesys was bundled within the FAS installation. From version 2.8.0.138 onwards, customers are required to download and install Codesys independently. This change impacts the handling of security vulnerabilities (CVEs) related to Codesys. Any Codesys-related security issues must now be addressed by the customer through their separate Codesys installation. The FAS itself includes only the connector component, which is maintained and updated within the suite. Please ensure that Codesys is kept up to date independently to mitigate any potential security risks associated with the Codesys software.

07

also known as (4)

Other names and identifiers for this entity.

08

sources

Which sources assert this record, and when.

cnnvdenisa_euvdfstec_bducisa_csaf_otfesto_psirtwago_psirtNVDCVE.orgMITRE
published 2021-08-03modified 2026-06-17
10

references (3)

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