CVE-2013-1864: The Portable Tool Library (aka PTLib) before 2.10.10, as used in Ekiga before 4.0.1, does not properly detect

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MEDIUM 4.3WATCHLISTDOWNGRADEUPGRADEDOWNGRADE

CVE-2013-1864 is a medium-severity flaw (CVSS 4.3) affecting portable tool library, ekiga, suse linux enterprise software development kit. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The Portable Tool Library (aka PTLib) before 2.10.10, as used in Ekiga before 4.0.1, does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a crafted PXML document containing a large number of nested entity references, aka a "billion laughs attack."

Why this priority

Public exploit reference
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
EPSS exploit chance	2.9% (top 13%)
CISA exploited list	No
Weakness	CWE-119
Published	2014-05-23
Last modified	2026-06-16

Publisher (CNA): Red Hat, Inc. · Vendor: ekiga · opalvoip · suse

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

Am I affected?

Timeline

2014-05-23 14:55 UTCPublished CVE record published
2026-06-16 23:52 UTCUpdated Record last modified

opalvoip portable tool library DOWNGRADE

Affected: 2.10.1 · 2.10.2 · 2.10.7 · 2.10.9

Fixed in: no fixed release known

Safe to downgrade to: a release before 2.10.1

1. Check installed version

apt-cache policy portable-tool-library || rpm -q portable-tool-library || portable-tool-library --version

2. No fixed release: DOWNGRADE to a release before 2.10.1 (Debian / Ubuntu)

apt-cache madison portable-tool-library sudo apt install portable-tool-library=<VERSION_BEFORE_2.10.1> sudo apt-mark hold portable-tool-library

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

dnf --showduplicates list portable-tool-library sudo dnf downgrade portable-tool-library-<VERSION_BEFORE_2.10.1> sudo dnf versionlock add portable-tool-library

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.

ekiga ekiga UPGRADE

Affected: <= 4.0.0

Fixed in: newer than 4.0.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to newer than 4.0.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade ekiga

Note

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

suse suse linux enterprise software development kit DOWNGRADE

Affected: 11.0 sp3

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

1. Check installed version

apt-cache policy suse-linux-enterprise-software-development-kit || rpm -q suse-linux-enterprise-software-development-kit || suse-linux-enterprise-software-development-kit --version

2. No fixed release: DOWNGRADE to a release before 11.0 (Debian / Ubuntu)

apt-cache madison suse-linux-enterprise-software-development-kit sudo apt install suse-linux-enterprise-software-development-kit=<VERSION_BEFORE_11.0> sudo apt-mark hold suse-linux-enterprise-software-development-kit

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

dnf --showduplicates list suse-linux-enterprise-software-development-kit sudo dnf downgrade suse-linux-enterprise-software-development-kit-<VERSION_BEFORE_11.0> sudo dnf versionlock add suse-linux-enterprise-software-development-kit

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.

suse suse linux enterprise desktop MITIGATE

Affected: 11.0 sp3

Fixed in: no fixed release known

Safe to downgrade to: a release before 11.0

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.

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-2013-1864?

portable tool library: downgrade or apply the listed mitigation; ekiga: upgrade to newer than 4.0.0; suse linux enterprise software development kit: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-1864 being exploited?

CVE-2013-1864 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-2013-1864 affect?

CVE-2013-1864 affects portable tool library, ekiga, suse linux enterprise software development kit. Severity is medium (CVSS 4.3). The Portable Tool Library (aka PTLib) before 2.10.10, as used in Ekiga before 4.0.1, does not properly detect recursion during entity expansion, which allows remote attackers to cause a denial of service (memory and CPU consumption) via a c

How urgent is CVE-2013-1864?

Priority 47/100. Public exploit reference; On your watchlist

References

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