CVE-2019-19315: NLSSRV32.EXE in Nalpeiron Licensing Service 7.3.4.0, as used with Nitro PDF and other products, allows Elevati

This month

HIGH 7.1DOWNGRADE

CVE-2019-19315 is a high-severity flaw (CVSS 7.1) affecting licensing service. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

NLSSRV32.EXE in Nalpeiron Licensing Service 7.3.4.0, as used with Nitro PDF and other products, allows Elevation of Privilege via the \\.\mailslot\nlsX86ccMailslot mailslot.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.1 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.6% (top 50%)
CISA exploited list	No
Weakness	CWE-732
Published	2019-12-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: nalpeiron

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

Am I affected?

Timeline

2019-12-17 15:15 UTCPublished CVE record published
2026-06-17 02:26 UTCUpdated Record last modified

nalpeiron licensing service DOWNGRADE

Affected: 7.3.4.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 7.3.4.0

1. Check installed version

apt-cache policy licensing-service || rpm -q licensing-service || licensing-service --version

2. No fixed release: DOWNGRADE to a release before 7.3.4.0 (Debian / Ubuntu)

apt-cache madison licensing-service sudo apt install licensing-service=<VERSION_BEFORE_7.3.4.0> sudo apt-mark hold licensing-service

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

dnf --showduplicates list licensing-service sudo dnf downgrade licensing-service-<VERSION_BEFORE_7.3.4.0> sudo dnf versionlock add licensing-service

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-2019-19315?

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

Is CVE-2019-19315 being exploited?

CVE-2019-19315 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-2019-19315 affect?

CVE-2019-19315 affects licensing service. Severity is high (CVSS 7.1). NLSSRV32.EXE in Nalpeiron Licensing Service 7.3.4.0, as used with Nitro PDF and other products, allows Elevation of Privilege via the \\.\mailslot\nlsX86ccMailslot mailslot.

How urgent is CVE-2019-19315?

Priority 42/100. High severity; Public exploit reference

References

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