How severe is CVE-2019-18858?

CVE-2019-18858 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2019-18858 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2019-18858?

CVE-2019-18858 primarily affects Codesys Control For Beaglebone. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2019-18858?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2019-18858 published?

CVE-2019-18858 was published on 2019-11-20 and last updated on 2026-06-17.

CVE-2019-18858

CVE-2019-18858 is a critical-severity vulnerability in Codesys Control For Beaglebone with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-120.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v2: 7.5
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-120
Affected product: Codesys Control For Beaglebone
Published: 2019-11-20
Last modified: 2026-06-17

Description

CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.

Frequently asked questions

What is CVE-2019-18858?: CODESYS 3 web server before 3.5.15.20, as distributed with CODESYS Control runtime systems, has a Buffer Overflow.
How severe is CVE-2019-18858?: CVE-2019-18858 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2019-18858 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2019-18858?: CVE-2019-18858 primarily affects Codesys Control For Beaglebone. In total, 14 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2019-18858?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2019-18858 published?: CVE-2019-18858 was published on 2019-11-20 and last updated on 2026-06-17.

References

Affected products (14)

cpe:2.3:a:codesys:control_for_beaglebone:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_empc-a\/imx6:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_iot2000:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_linux:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_pfc100:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_pfc200:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_plcnext:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_for_raspberry_pi:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_rte:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_runtime_system_toolkit:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:control_win:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:embedded_target_visu_toolkit:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:hmi:*:*:*:*:*:*:*:*
cpe:2.3:a:codesys:remote_target_visu_toolkit:*:*:*:*:*:*:*:*

More vulnerabilities in Codesys Control For Beaglebone

CVE-2020-10245 — Critical (CVSS 9.8): CODESYS V3 web server before 3.5.15.40, as used in CODESYS Control runtime systems, has a buffer overflow.
CVE-2019-13548 — Critical (CVSS 9.8): CODESYS V3 web server, all versions prior to 3.5.14.10, allows an attacker to send specially crafted http or https…
CVE-2018-25048 — High (CVSS 8.8): The CODESYS runtime system in multiple versions allows an remote low privileged attacker to use a path traversal…
CVE-2019-9008 — High (CVSS 8.8): An issue was discovered in 3S-Smart CODESYS V3 through 3.5.12.30. A user with low privileges can take full control over…
CVE-2020-12069 — High (CVSS 7.8): In CODESYS V3 products in all versions prior V3.5.16.0 containing the CmpUserMgr, the CODESYS Control runtime system…
CVE-2022-30792 — High (CVSS 7.5): In CmpChannelServer of CODESYS V3 in multiple versions an uncontrolled ressource consumption allows an unauthorized…

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