CVE-2013-2064: Integer overflow in X.org libxcb 1.9 and earlier allows X servers to trigger allocation of insufficient memory

Q: How do I fix CVE-2013-2064?

debian linux: mitigate or apply the listed mitigation; secure global desktop: downgrade or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Q: Is CVE-2013-2064 being exploited?

CVE-2013-2064 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-2013-2064 affect?

CVE-2013-2064 affects debian linux, secure global desktop, ubuntu linux. Severity is medium (CVSS 6.8). Integer overflow in X.org libxcb 1.9 and earlier allows X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the read_packet function.

Q: How urgent is CVE-2013-2064?

Priority 50/100. On your watchlist

This month

MEDIUM 6.8WATCHLISTMITIGATEDOWNGRADEMITIGATE

CVE-2013-2064 is a medium-severity flaw (CVSS 6.8) affecting debian linux, secure global desktop, ubuntu linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Integer overflow in X.org libxcb 1.9 and earlier allows X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the read_packet function.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	2.5% (top 16%)
CISA exploited list	No
Weakness	CWE-189
Published	2013-06-15
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: canonical · debian · fedoraproject · opensuse · oracle · x

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

Am I affected?

Timeline

2013-06-15 19:55 UTCPublished CVE record published
2026-06-16 23:52 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 6.0 · 7.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 6.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

oracle secure global desktop DOWNGRADE

Affected: 4.71 · 5.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 4.71

1. Check installed version

apt-cache policy secure-global-desktop || rpm -q secure-global-desktop || secure-global-desktop --version

2. No fixed release: DOWNGRADE to a release before 4.71 (Debian / Ubuntu)

apt-cache madison secure-global-desktop sudo apt install secure-global-desktop=<VERSION_BEFORE_4.71> sudo apt-mark hold secure-global-desktop

2. No fixed release: DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list secure-global-desktop sudo dnf downgrade secure-global-desktop-<VERSION_BEFORE_4.71> sudo dnf versionlock add secure-global-desktop

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

canonical ubuntu linux MITIGATE

Affected: 10.04 · 12.04 · 12.10 · 13.04

Fixed in: no fixed release known

Safe to downgrade to: a release before 10.04

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

opensuse opensuse MITIGATE

Affected: 12.2 · 12.3

Fixed in: no fixed release known

Safe to downgrade to: a release before 12.2

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

fedoraproject fedora MITIGATE

Affected: 19

Fixed in: no fixed release known

Safe to downgrade to: a release before 19

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

x libxcb UPGRADE

Affected: <= 1.9 · 1.1.90.1 · 1.1.91 · 1.1.92 · 1.1.93 · 1.2 · 1.3 · 1.4

Fixed in: newer than 1.9

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 1.9 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade libxcb

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-2013-2064?

debian linux: mitigate or apply the listed mitigation; secure global desktop: downgrade or apply the listed mitigation; ubuntu linux: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-2064 being exploited?

CVE-2013-2064 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-2013-2064 affect?

CVE-2013-2064 affects debian linux, secure global desktop, ubuntu linux. Severity is medium (CVSS 6.8). Integer overflow in X.org libxcb 1.9 and earlier allows X servers to trigger allocation of insufficient memory and a buffer overflow via vectors related to the read_packet function.

How urgent is CVE-2013-2064?

Priority 50/100. On your watchlist

Software pages

Ubuntu vulnerabilities · Debian vulnerabilities

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References

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