How severe is CVE-2020-36429?

CVE-2020-36429 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2020-36429 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2020-36429?

CVE-2020-36429 affects Open62541. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2020-36429?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2020-36429 published?

CVE-2020-36429 was published on 2021-07-20 and last updated on 2026-06-17.

CVE-2020-36429

CVE-2020-36429 is a medium-severity vulnerability in Open62541 with a CVSS 3.x base score of 5.5. 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-787.

Key facts

Severity: Medium (CVSS 3.x base score 5.5)
CVSS v2: 2.1
EPSS exploit prediction: 0% (23rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Open62541
Published: 2021-07-20
Last modified: 2026-06-17

Description

Variant_encodeJson in open62541 1.x before 1.0.4 has an out-of-bounds write for a large recursion depth.

Frequently asked questions

What is CVE-2020-36429?: Variant_encodeJson in open62541 1.x before 1.0.4 has an out-of-bounds write for a large recursion depth.
How severe is CVE-2020-36429?: CVE-2020-36429 has a CVSS 3.x base score of 5.5, rated medium severity. It is exploitable over local access with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2020-36429 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (23rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2020-36429?: CVE-2020-36429 affects Open62541. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2020-36429?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2020-36429 published?: CVE-2020-36429 was published on 2021-07-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:open62541:open62541:*:*:*:*:*:*:*:*

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