CVE-2019-12584: Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an XSS issue in apcupsd_

Q: How do I fix CVE-2019-12584?

apcupsd: downgrade or apply the listed mitigation; pfsense: upgrade to 2.4.4. Exact commands for each OS are on this page.

Q: Is CVE-2019-12584 being exploited?

CVE-2019-12584 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2019-12584 affect?

CVE-2019-12584 affects apcupsd, pfsense. Severity is medium (CVSS 6.1). Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an XSS issue in apcupsd_status.php.

Q: How urgent is CVE-2019-12584?

Priority 43/100. No elevated risk signals yet.

This month

MEDIUM 6.1DOWNGRADEUPGRADE

CVE-2019-12584 is a medium-severity flaw (CVSS 6.1) affecting apcupsd, pfsense. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an XSS issue in apcupsd_status.php.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.1 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	2.6% (top 15%)
CISA exploited list	No
Weakness	CWE-79
Published	2019-06-03
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: apcupsd · netgate

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

Am I affected?

Timeline

2019-06-03 03:29 UTCPublished CVE record published
2026-06-17 02:14 UTCUpdated Record last modified

apcupsd apcupsd DOWNGRADE

Affected: 0.3.91_5

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.3.91_5

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.3.91_5 (Debian / Ubuntu)

apt-cache madison apcupsd sudo apt install apcupsd=<VERSION_BEFORE_0.3.91_5> sudo apt-mark hold apcupsd

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

dnf --showduplicates list apcupsd sudo dnf downgrade apcupsd-<VERSION_BEFORE_0.3.91_5> sudo dnf versionlock add apcupsd

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.

netgate pfsense UPGRADE

Affected: < 2.4.4 · 2.4.4 · 2.4.4 p1 · 2.4.4 p2 · 2.4.4 p3

Fixed in: 2.4.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 2.4.4 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade pfsense

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade pfsense

Note

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

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-2019-12584?

apcupsd: downgrade or apply the listed mitigation; pfsense: upgrade to 2.4.4. Exact commands for each OS are on this page.

Is CVE-2019-12584 being exploited?

CVE-2019-12584 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-2019-12584 affect?

CVE-2019-12584 affects apcupsd, pfsense. Severity is medium (CVSS 6.1). Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an XSS issue in apcupsd_status.php.

How urgent is CVE-2019-12584?

Priority 43/100. No elevated risk signals yet.

Software pages

PHP vulnerabilities · pfSense and OPNsense vulnerabilities

Related CVEs

CVE-2019-12585 CRITICAL 9.8 DOWNGRADE UPGRADE Apcupsd 0.3.91_5, as used in pfSense through 2.4.4-RELEASE-p3 and other products, has an Arbitrary Command Exe

References

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