How severe is CVE-2021-39818?

CVE-2021-39818 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-39818 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-39818?

CVE-2021-39818 primarily affects Adobe Incopy. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-39818?

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-2021-39818 published?

CVE-2021-39818 was published on 2021-09-27 and last updated on 2026-06-17.

CVE-2021-39818

CVE-2021-39818 is a high-severity vulnerability in Adobe Incopy with a CVSS 3.x base score of 7.8. 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-119.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 6.8
EPSS exploit prediction: 2% (74th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-119
Affected product: Adobe Incopy
Published: 2021-09-27
Last modified: 2026-06-17

Description

Adobe InCopy version 11.1 (and earlier) is affected by a memory corruption vulnerability due to insecure handling of a malicious TIFF file, potentially resulting in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability.

Frequently asked questions

What is CVE-2021-39818?: Adobe InCopy version 11.1 (and earlier) is affected by a memory corruption vulnerability due to insecure handling of a malicious TIFF file, potentially resulting in arbitrary code execution in the context of the current user. User interaction is required to exploit this vulnerability.
How severe is CVE-2021-39818?: CVE-2021-39818 has a CVSS 3.x base score of 7.8, rated high severity. It is exploitable over local access with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-39818 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (74th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-39818?: CVE-2021-39818 primarily affects Adobe Incopy. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-39818?: 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-2021-39818 published?: CVE-2021-39818 was published on 2021-09-27 and last updated on 2026-06-17.

References

https://helpx.adobe.com/security/products/incopy/apsb21-71.html

Affected products (2)

cpe:2.3:a:adobe:incopy:*:*:*:*:*:windows:*:*
cpe:2.3:a:adobe:incopy:*:*:*:*:*:macos:*:*

More vulnerabilities in Adobe Incopy

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CVE-2026-34708 — High (CVSS 7.8): InCopy versions 21.3, 20.5.3 and earlier are affected by a Stack-based Buffer Overflow vulnerability that could result…
CVE-2026-34707 — High (CVSS 7.8): InCopy versions 21.3, 20.5.3 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could result…
CVE-2026-34706 — High (CVSS 7.8): InCopy versions 21.3, 20.5.3 and earlier are affected by an out-of-bounds write vulnerability that could result in…
CVE-2026-34631 — High (CVSS 7.8): InCopy versions 20.5.2, 21.2 and earlier are affected by an out-of-bounds write vulnerability that could result in…
CVE-2026-27287 — High (CVSS 7.8): InCopy versions 20.5.2, 21.2 and earlier are affected by an out-of-bounds read vulnerability when parsing a crafted…

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