Vulnerability · Published Sep 6, 2023 · Assigned by adobe

CVE-2021-39859Use After Free Adobe Acrobat Pro DC [HB-21-0339]

Medium 5.5

In plain English

A medium-severity use-after-free in Acrobat Reader from Adobe. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 42% of all known vulnerabilities).

Severity (CVSS 3.1)5.5Medium

Exploit odds (30 days)0.5%top 58.1% of all CVEs

Exploited in the wildNo reportsnot in CISA KEV

Attack toolingNoneno public tooling known

Official description

Acrobat Reader DC versions 2021.005.20060 (and earlier), 2020.004.30006 (and earlier) and 2017.011.30199 (and earlier) are affected by a Use After Free 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 file.

Affected products (as reported)

Vendor	Product	Versions
Adobe	Acrobat Reader	0 – through 2021.005.20060

Weakness: CWE-416 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

https://helpx.adobe.com/security/products/acrobat/apsb21-55.html vendor-advisory