CVE-2019-14323: SSDP Responder 1.x through 1.5 mishandles incoming network messages, leading to a stack-based buffer overflow

This week

HIGH 7.5REMOTEUPGRADE

CVE-2019-14323 is a high-severity flaw (CVSS 7.5) affecting simple service discovery protocol responder. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

SSDP Responder 1.x through 1.5 mishandles incoming network messages, leading to a stack-based buffer overflow by 1 byte. This results in a crash of the server, but only when strict stack checking is enabled. This is caused by an off-by-one error in ssdp_recv in ssdpd.c.

Why this priority

High severity
Public exploit reference
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	1.7% (top 23%)
CISA exploited list	No
Weakness	CWE-193, CWE-787
Published	2019-07-28
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: simple service discovery protocol responder project

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2019-07-28 13:15 UTCPublished CVE record published
2026-06-17 02:18 UTCUpdated Record last modified

simple service discovery protocol responder project simple service discovery protocol responder UPGRADE

Affected: >= 1.0 and <= 1.5

Fixed in: newer than 1.5

Safe to downgrade to: a release before 1.0

1. Check installed version

apt-cache policy simple-service-discovery-protocol-responder || rpm -q simple-service-discovery-protocol-responder || simple-service-discovery-protocol-responder --version

2. UPGRADE to newer than 1.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade simple-service-discovery-protocol-responder

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade simple-service-discovery-protocol-responder

Note

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

3. If no update is available yet, DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison simple-service-discovery-protocol-responder sudo apt install simple-service-discovery-protocol-responder=<VERSION_BEFORE_1.0> sudo apt-mark hold simple-service-discovery-protocol-responder

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list simple-service-discovery-protocol-responder sudo dnf downgrade simple-service-discovery-protocol-responder-<VERSION_BEFORE_1.0> sudo dnf versionlock add simple-service-discovery-protocol-responder

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.

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-2019-14323?

simple service discovery protocol responder: upgrade to newer than 1.5. Exact commands for each OS are on this page.

Is CVE-2019-14323 being exploited?

CVE-2019-14323 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-2019-14323 affect?

CVE-2019-14323 affects simple service discovery protocol responder. Severity is high (CVSS 7.5). SSDP Responder 1.x through 1.5 mishandles incoming network messages, leading to a stack-based buffer overflow by 1 byte. This results in a crash of the server, but only when strict stack checking is enabled. This is caused by an off-by-one

How urgent is CVE-2019-14323?

Priority 55/100. High severity; Public exploit reference; Remotely exploitable, no login, no user action

References

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