CVE-2015-5177: Double free vulnerability in the SLPDKnownDAAdd function in slpd/slpd_knownda.c in OpenSLP 1.2.1 allows remote

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HIGH 7.5REMOTEWATCHLISTDOWNGRADEMITIGATE

CVE-2015-5177 is a high-severity flaw (CVSS 7.5) affecting openslp, debian linux. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Double free vulnerability in the SLPDKnownDAAdd function in slpd/slpd_knownda.c in OpenSLP 1.2.1 allows remote attackers to cause a denial of service (crash) via a crafted package.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
Public exploit reference
Remotely exploitable, no login, no user action
On your watchlist

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

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	6.3% (top 6%)
CISA exploited list	No
Weakness	CWE-415
Published	2017-10-22
Last modified	2026-06-17

Publisher (CNA): Red Hat, Inc. · Vendor: debian · openslp

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

Am I affected?

Timeline

2017-10-22 18:29 UTCPublished CVE record published
2026-06-17 00:28 UTCUpdated Record last modified

openslp openslp DOWNGRADE

Affected: 1.2.1

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.2.1

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.2.1 (Debian / Ubuntu)

apt-cache madison openslp sudo apt install openslp=<VERSION_BEFORE_1.2.1> sudo apt-mark hold openslp

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

dnf --showduplicates list openslp sudo dnf downgrade openslp-<VERSION_BEFORE_1.2.1> sudo dnf versionlock add openslp

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.

debian debian linux MITIGATE

Affected: 7.0 · 8.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.0

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-2015-5177?

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

Is CVE-2015-5177 being exploited?

CVE-2015-5177 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-2015-5177 affect?

CVE-2015-5177 affects openslp, debian linux. Severity is high (CVSS 7.5). Double free vulnerability in the SLPDKnownDAAdd function in slpd/slpd_knownda.c in OpenSLP 1.2.1 allows remote attackers to cause a denial of service (crash) via a crafted package.

How urgent is CVE-2015-5177?

Priority 65/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action; On your watchlist

Software pages

Debian vulnerabilities

Related CVEs

CVE-2017-17833 CRITICAL 9.8 DOWNGRADE MITIGATE OpenSLP releases in the 1.0.2 and 1.1.0 code streams have a heap-related memory corruption issue which may man
CVE-2016-4912 HIGH 7.5 DOWNGRADE The _xrealloc function in xlsp_xmalloc.c in OpenSLP 2.0.0 allows remote attackers to cause a denial of service
CVE-2012-4428 HIGH 7.5 DOWNGRADE MITIGATE openslp: SLPIntersectStringList()' Function has a DoS vulnerability

References

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