How severe is CVE-2018-20213?

CVE-2018-20213 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2018-20213 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2018-20213?

CVE-2018-20213 affects Libexcel Project Libexcel. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2018-20213?

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

When was CVE-2018-20213 published?

CVE-2018-20213 was published on 2018-12-18 and last updated on 2026-06-17.

CVE-2018-20213

CVE-2018-20213 is a high-severity vulnerability in Libexcel Project Libexcel with a CVSS 3.x base score of 7.5. 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-119.

Key facts

Severity: High (CVSS 3.x base score 7.5)
CVSS v2: 5.0
EPSS exploit prediction: 1% (60th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Libexcel Project Libexcel
Published: 2018-12-18
Last modified: 2026-06-17

Description

wbook_addworksheet in workbook.c in libexcel.a in libexcel 0.01 allows attackers to cause a denial of service (SEGV) via a long name. NOTE: this is not a Microsoft product.

Frequently asked questions

What is CVE-2018-20213?: wbook_addworksheet in workbook.c in libexcel.a in libexcel 0.01 allows attackers to cause a denial of service (SEGV) via a long name. NOTE: this is not a Microsoft product.
How severe is CVE-2018-20213?: CVE-2018-20213 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2018-20213 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (60th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2018-20213?: CVE-2018-20213 affects Libexcel Project Libexcel. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2018-20213?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2018-20213 published?: CVE-2018-20213 was published on 2018-12-18 and last updated on 2026-06-17.

References

https://github.com/devinsmith/libexcel/issues/8

Affected products (1)

cpe:2.3:a:libexcel_project:libexcel:0.01:*:*:*:*:*:*:*

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