How severe is CVE-2021-43757?

CVE-2021-43757 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-2021-43757 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-43757?

CVE-2021-43757 primarily affects Adobe Media Encoder. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2021-43757?

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-2021-43757 published?

CVE-2021-43757 was published on 2023-07-12 and last updated on 2026-06-17.

CVE-2021-43757

CVE-2021-43757 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-125.

Key facts

Severity: High (CVSS 3.x base score 7.8)
EPSS exploit prediction: 0% (25th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-125
Affected product: Adobe Media Encoder
Published: 2023-07-12
Last modified: 2026-06-17

Description

Adobe Media Encoder versions 22.0, 15.4.2 (and earlier) are affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR. Exploitation of this issue requires user interaction in that a victim must open a malicious 3GP file

Frequently asked questions

What is CVE-2021-43757?: Adobe Media Encoder versions 22.0, 15.4.2 (and earlier) are affected by an out-of-bounds read vulnerability that could lead to disclosure of sensitive memory. An attacker could leverage this vulnerability to bypass mitigations such as ASLR. Exploitation of this issue requires user interaction in that a victim must open a malicious 3GP file
How severe is CVE-2021-43757?: CVE-2021-43757 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-2021-43757 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (25th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-43757?: CVE-2021-43757 primarily affects Adobe Media Encoder. In total, 2 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2021-43757?: 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-2021-43757 published?: CVE-2021-43757 was published on 2023-07-12 and last updated on 2026-06-17.

References

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

Affected products (2)

cpe:2.3:a:adobe:media_encoder:*:*:*:*:*:*:*:*
cpe:2.3:a:adobe:media_encoder:22.0:*:*:*:*:*:*:*

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-125 (Out-of-bounds Read) vulnerabilities

CVE-2026-24826 — Critical (CVSS 10.0): Out-of-bounds Write, Divide By Zero, NULL Pointer Dereference, Use of Uninitialized Resource, Out-of-bounds Read,…
CVE-2024-22004 — Critical (CVSS 10.0): Due to length check, an attacker with privilege access on a Linux Nonsecure operating system can trigger a…
CVE-2021-41556 — Critical (CVSS 10.0): sqclass.cpp in Squirrel through 2.2.5 and 3.x through 3.1 allows an out-of-bounds read (in the core interpreter) that…
CVE-2021-21777 — Critical (CVSS 10.0): An information disclosure vulnerability exists in the Ethernet/IP UDP handler functionality of EIP Stack Group OpENer…
CVE-2017-14451 — Critical (CVSS 10.0): An exploitable out-of-bounds read vulnerability exists in libevm (Ethereum Virtual Machine) of CPP-Ethereum. A…
CVE-2013-0767 — Critical (CVSS 10.0): The nsSVGPathElement::GetPathLengthScale function in Mozilla Firefox before 18.0, Firefox ESR 10.x before 10.0.12 and…

Browse all CWE-125 (Out-of-bounds Read) vulnerabilities →