No exploitation reportedFix available

CVE-2020-35198

Q: Is CVE-2020-35198 actively exploited?

Active exploitation of CVE-2020-35198 has not been confirmed. Its EPSS score was 2.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2020-35198?

CVE-2020-35198 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

No exploitation reported by the sources we read.

Published2021-05-12
WeaknessCWE-190

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

An issue was discovered in Wind River VxWorks 7. The memory allocator has a possible integer overflow in calculating a memory block's size to be allocated by calloc(). As a result, the actual memory allocated is smaller than the buffer size specified by the arguments, leading to memory corruption.

Timeline

dates in UTC

2021-05-1211:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2020-35198?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2020-35198?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD

Oracle communications eagle

Branch	Affected	Fixed in	Source
46.8	≥ 46.8.0, ≤ 46.8.2	no fix published	NVD
46.9	≥ 46.9.1, ≤ 46.9.3	no fix published	NVD
46.7	= 46.7.0	no fix published	NVD

Windriver vxworks

Branch	Affected	Fixed in	Source
21.3	≥ 7.0, < 21.03	21.03	NVD
6.9	≥ 6.9, < 6.9.4.12	6.9.4.12	NVD
6.9	= 6.9.4.12	no fix published	NVD

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Vendor advisories

ICSA-23-103-13 CISA107 known affected
Siemens SCALANCE Switch Families
SCALANCE X200-4P IRT (6GK5200-4AH00-2BA3) · SCALANCE X201-3P IRT (6GK5201-3BH00-2BA3) · SCALANCE X201-3P IRT PRO (6GK5201-3JR00-2BA6) · +104 more
ICSA-25-155-02 CISA12 known affected
Hitachi Energy Relion 670 650 series and SAM600-IO Product
Relion 670 series version 2.2.5 revisions up to 2.2.5.1 · Relion 670 series version 2.2.4 revisions up to 2.2.4.2 · Relion 670 series version 2.2.3 revisions up to 2.2.3.4 · +9 more

Full record on NVD

Fix

Vendor fix CISA ICSA-23-103-13 · 17 productsUpdate to V5.2.6 or later version
Vendor fix CISA ICSA-23-103-13 · 15 productsUpdate to V5.5.2 or later version
Vendor fix CISA ICSA-25-155-02 · 3 productsUpdate to 2.2.5.2 version or latest
Vendor fix CISA ICSA-25-155-02 · 2 productsUpdate to 2.2.4.3 version or latest
Vendor fix CISA ICSA-25-155-02 · 1 productUpdate to 2.2.3.5 version or latest
Vendor fix CISA ICSA-25-155-02 · 1 productUpdate to 2.2.2.5 version or latest

Advisories and patches

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

NVDCVSS 3.19.8read 2026-10-23
NVDCVSS 2.07.5read 2026-10-23
NVDweakness (CWE)CWE-190read 2026-10-23
FIRST EPSSEPSS score2.5 %2026-10-23

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published: 2021-05-12
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2020-35198?

Is CVE-2020-35198 actively exploited?

Active exploitation of CVE-2020-35198 has not been confirmed. Its EPSS score was 2.5% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-35198?

CVE-2020-35198 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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