How severe is CVE-2021-21098?

CVE-2021-21098 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-21098 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-21098?

CVE-2021-21098 affects Adobe Indesign. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-21098?

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-2021-21098 published?

CVE-2021-21098 was published on 2021-06-28 and last updated on 2026-06-17.

CVE-2021-21098

CVE-2021-21098 is a high-severity vulnerability in Adobe Indesign with a CVSS 3.x base score of 8.8. 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-787.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 9.3
EPSS exploit prediction: 6% (92nd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Adobe Indesign
Published: 2021-06-28
Last modified: 2026-06-17

Description

Adobe InDesign version 16.0 (and earlier) is affected by an Out-of-bounds Write vulnerability when parsing a crafted file. An unauthenticated attacker could leverage this vulnerability to achieve remote code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.

Frequently asked questions

What is CVE-2021-21098?: Adobe InDesign version 16.0 (and earlier) is affected by an Out-of-bounds Write vulnerability when parsing a crafted file. An unauthenticated attacker could leverage this vulnerability to achieve remote code execution in the context of the current user. Exploitation of this issue requires user interaction in that a victim must open a malicious file.
How severe is CVE-2021-21098?: CVE-2021-21098 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-21098 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 6% (92nd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-21098?: CVE-2021-21098 affects Adobe Indesign. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-21098?: 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-2021-21098 published?: CVE-2021-21098 was published on 2021-06-28 and last updated on 2026-06-17.

References

https://helpx.adobe.com/security/products/indesign/apsb21-22.html

Affected products (1)

cpe:2.3:a:adobe:indesign:*:*:*:*:*:*:*:*

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