CVE-2011-4373: Adobe Reader and Acrobat before 9.5, and 10.x before 10.1.2, on Windows and Mac OS X allow attackers to execut

Q: How do I fix CVE-2011-4373?

acrobat: upgrade to newer than 10.1.1; reader: upgrade to newer than 10.1.1. Exact commands for each OS are on this page.

Q: Is CVE-2011-4373 being exploited?

CVE-2011-4373 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2011-4373 affect?

CVE-2011-4373 affects acrobat, reader. Severity is critical (CVSS 9.8). Adobe Reader and Acrobat before 9.5, and 10.x before 10.1.2, on Windows and Mac OS X allow attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2011

Q: How urgent is CVE-2011-4373?

Priority 64/100. Critical severity; EPSS top 2%: very likely to be exploited; Remotely exploitable, no login, no user action

This week

CRITICAL 9.8REMOTEUPGRADEUPGRADE

CVE-2011-4373 is a critical-severity flaw (CVSS 9.8) affecting acrobat, reader. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Adobe Reader and Acrobat before 9.5, and 10.x before 10.1.2, on Windows and Mac OS X allow attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2011-4370 and CVE-2011-4372.

Why this priority

Critical severity
EPSS top 2%: very likely to be exploited
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	30.3% (top 2%)
CISA exploited list	No
Weakness	CWE-787
Published	2012-01-10
Last modified	2026-06-16

Publisher (CNA): Adobe Systems Incorporated · Vendor: adobe

Last updated 2026-06-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2012-01-10 21:55 UTCPublished CVE record published
2026-06-16 23:34 UTCUpdated Record last modified

adobe acrobat UPGRADE

Affected: <= 10.1.1 · <= 9.4.6 · 9.4.7 · <= 9.4.5 · 9.4.6

Fixed in: newer than 10.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy acrobat || rpm -q acrobat || acrobat --version

2. UPGRADE to newer than 10.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade acrobat

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade acrobat

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

adobe reader UPGRADE

Affected: <= 10.1.1 · <= 9.4.6 · 9.4.7 · <= 9.4.5 · 9.4.6

Fixed in: newer than 10.1.1

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy reader || rpm -q reader || reader --version

2. UPGRADE to newer than 10.1.1 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade reader

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade reader

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2011-4373?

acrobat: upgrade to newer than 10.1.1; reader: upgrade to newer than 10.1.1. Exact commands for each OS are on this page.

Is CVE-2011-4373 being exploited?

CVE-2011-4373 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2011-4373 affect?

CVE-2011-4373 affects acrobat, reader. Severity is critical (CVSS 9.8). Adobe Reader and Acrobat before 9.5, and 10.x before 10.1.2, on Windows and Mac OS X allow attackers to execute arbitrary code or cause a denial of service (memory corruption) via unspecified vectors, a different vulnerability than CVE-2011

How urgent is CVE-2011-4373?

Priority 64/100. Critical severity; EPSS top 2%: very likely to be exploited; Remotely exploitable, no login, no user action

Software pages

Windows vulnerabilities · Adobe Acrobat vulnerabilities · Adobe Reader vulnerabilities

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References

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