CVE-2018-15506: In BubbleUPnP 0.9 update 30, the XML parsing engine for SSDP/UPnP functionality is vulnerable to an XML Extern

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2018-15506 is a critical-severity flaw (CVSS 9.8) affecting bubbleupnp. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In BubbleUPnP 0.9 update 30, the XML parsing engine for SSDP/UPnP functionality is vulnerable to an XML External Entity Processing (XXE) attack. Remote, unauthenticated attackers can use this vulnerability to: (1) Access arbitrary files from the filesystem with the same permission as the user account running BubbleUPnP, (2) Initiate SMB connections to capture a NetNTLM challenge/response and crack the cleartext password, or (3) Initiate SMB conne

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Remotely exploitable, no login, no user action

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

Risk facts

CVSS score	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	4.7% (top 8%)
CISA exploited list	No
Weakness	CWE-611
Published	2019-06-19
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: bubblesoftapps

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

Am I affected?

Timeline

2019-06-19 17:15 UTCPublished CVE record published
2026-06-17 01:42 UTCUpdated Record last modified

bubblesoftapps bubbleupnp DOWNGRADE

Affected: 0.9 update_30

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.9

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.9 (Debian / Ubuntu)

apt-cache madison bubbleupnp sudo apt install bubbleupnp=<VERSION_BEFORE_0.9> sudo apt-mark hold bubbleupnp

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

dnf --showduplicates list bubbleupnp sudo dnf downgrade bubbleupnp-<VERSION_BEFORE_0.9> sudo dnf versionlock add bubbleupnp

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-2018-15506?

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

Is CVE-2018-15506 being exploited?

CVE-2018-15506 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-2018-15506 affect?

CVE-2018-15506 affects bubbleupnp. Severity is critical (CVSS 9.8). In BubbleUPnP 0.9 update 30, the XML parsing engine for SSDP/UPnP functionality is vulnerable to an XML External Entity Processing (XXE) attack. Remote, unauthenticated attackers can use this vulnerability to: (1) Access arbitrary files fro

How urgent is CVE-2018-15506?

Priority 62/100. Critical severity; EPSS top 8%: very likely to be exploited; Remotely exploitable, no login, no user action

References

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