How severe is CVE-2021-43756?

CVE-2021-43756 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-2021-43756 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43756?

CVE-2021-43756 affects Adobe Media Encoder. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-43756?

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-2021-43756 published?

CVE-2021-43756 was published on 2022-06-15 and last updated on 2026-06-17.

CVE-2021-43756

CVE-2021-43756 is a high-severity vulnerability in Adobe Media Encoder 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-787.

Key facts

Severity: High (CVSS 3.x base score 7.8)
CVSS v2: 9.3
EPSS exploit prediction: 2% (78th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-787
Affected product: Adobe Media Encoder
Published: 2022-06-15
Last modified: 2026-06-17

Description

Adobe Media Encoder versions 22.0, 15.4.2 (and earlier) are affected by an Out-of-bounds Write vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary 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-2021-43756?: Adobe Media Encoder versions 22.0, 15.4.2 (and earlier) are affected by an Out-of-bounds Write vulnerability. An unauthenticated attacker could leverage this vulnerability to achieve arbitrary 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-2021-43756?: CVE-2021-43756 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-2021-43756 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (78th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43756?: CVE-2021-43756 affects Adobe Media Encoder. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-43756?: 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-2021-43756 published?: CVE-2021-43756 was published on 2022-06-15 and last updated on 2026-06-17.

References

https://helpx.adobe.com/security/products/media-encoder/apsb21-118.html

Affected products (1)

cpe:2.3:a:adobe:media_encoder:*:*:*:*:*:*:*:*

More vulnerabilities in Adobe Media Encoder

CVE-2019-8246 — Critical (CVSS 9.8): Adobe Media Encoder versions 13.1 and earlier have an out-of-bounds write vulnerability. Successful exploitation could…
CVE-2019-7842 — High (CVSS 8.8): Adobe Media Encoder version 13.0.2 has a use-after-free vulnerability. Successful exploitation could lead to remote…
CVE-2026-34640 — High (CVSS 7.8): Media Encoder versions 26.0.2, 25.6.4 and earlier are affected by an Integer Overflow or Wraparound vulnerability that…
CVE-2026-34639 — High (CVSS 7.8): Media Encoder versions 26.0.2, 25.6.4 and earlier are affected by an out-of-bounds write vulnerability that could…
CVE-2025-27195 — High (CVSS 7.8): Media Encoder versions 25.1, 24.6.4 and earlier are affected by a Heap-based Buffer Overflow vulnerability that could…
CVE-2025-27194 — High (CVSS 7.8): Media Encoder versions 25.1, 24.6.4 and earlier are affected by an out-of-bounds write vulnerability that could result…

All CVEs affecting Adobe Media Encoder →

Other CWE-787 (Out-of-bounds Write) vulnerabilities

CVE-2026-42369 — Critical (CVSS 10.0): GV-VMS V20 is a Video Monitoring Software used to gather the feeds of many surveillance cameras and manage other…
CVE-2026-4746 — Critical (CVSS 10.0): Out-of-bounds Write vulnerability in timeplus-io proton (base/poco/Foundation/src‎ modules). This vulnerability is…
CVE-2025-43300 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved bounds checking. This issue is fixed in iOS 15.8.5 and iPadOS…
CVE-2025-24201 — Critical (CVSS 10.0): An out-of-bounds write issue was addressed with improved checks to prevent unauthorized actions. This issue is fixed in…
CVE-2024-42479 — Critical (CVSS 10.0): llama.cpp provides LLM inference in C/C++. The unsafe `data` pointer member in the `rpc_tensor` structure can cause…
CVE-2024-39791 — Critical (CVSS 10.0): Stack-based buffer overflow vulnerabilities affecting Vonets industrial wifi bridge relays and wifi bridge…

Browse all CWE-787 (Out-of-bounds Write) vulnerabilities →