CVE-2013-5680: Heap-based buffer overflow in hfaxd in HylaFAX+ 5.2.4 through 5.5.3, when using LDAP authentication, might all

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MEDIUM 6.8DOWNGRADE

CVE-2013-5680 is a medium-severity flaw (CVSS 6.8) affecting hylafax\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Heap-based buffer overflow in hfaxd in HylaFAX+ 5.2.4 through 5.5.3, when using LDAP authentication, might allow remote attackers to cause a denial of service (child hang) or execute arbitrary code via a long USER command.

Why this priority

EPSS top 5%: very likely to be exploited
Public exploit reference

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.8 (Medium)
EPSS exploit chance	7.9% (top 5%)
CISA exploited list	No
Weakness	CWE-119
Published	2014-04-06
Last modified	2026-06-16

Publisher (CNA): MITRE · Vendor: lee howard

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

Am I affected?

Timeline

2014-04-06 16:55 UTCPublished CVE record published
2026-06-16 23:59 UTCUpdated Record last modified

lee howard hylafax\+ DOWNGRADE

Affected: 5.2.4 · 5.2.5 · 5.2.6 · 5.2.7 · 5.2.8 · 5.2.9 · 5.3.0 · 5.4.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 5.2.4

1. Check installed version

apt-cache policy hylafax+ || rpm -q hylafax+ || hylafax+ --version

2. No fixed release: DOWNGRADE to a release before 5.2.4 (Debian / Ubuntu)

apt-cache madison hylafax+ sudo apt install hylafax+=<VERSION_BEFORE_5.2.4> sudo apt-mark hold hylafax+

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

dnf --showduplicates list hylafax+ sudo dnf downgrade hylafax+-<VERSION_BEFORE_5.2.4> sudo dnf versionlock add hylafax+

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: HylaFAX+ 5.2.4 > 5.5.3 - Buffer Overflow

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-2013-5680?

hylafax\+: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2013-5680 being exploited?

CVE-2013-5680 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-2013-5680 affect?

CVE-2013-5680 affects hylafax\+. Severity is medium (CVSS 6.8). Heap-based buffer overflow in hfaxd in HylaFAX+ 5.2.4 through 5.5.3, when using LDAP authentication, might allow remote attackers to cause a denial of service (child hang) or execute arbitrary code via a long USER command.

How urgent is CVE-2013-5680?

Priority 52/100. EPSS top 5%: very likely to be exploited; Public exploit reference

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References

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