CVE-2021-45887: An issue was discovered in PONTON X/P Messenger before 3.11.2

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2021-45887 is a critical-severity flaw (CVSS 9.8) affecting x\/p messenger. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in PONTON X/P Messenger before 3.11.2. Due to path traversal in private/SchemaSetUpload.do for uploaded ZIP files, an executable script can be uploaded by web application administrators, giving the attacker remote code execution on the underlying server via an imgs/*.jsp URI.

Why this priority

Critical severity
Public exploit reference
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	3.5% (top 11%)
CISA exploited list	No
Weakness	CWE-22
Published	2022-03-13
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: ponton

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

Am I affected?

Timeline

2022-03-13 02:15 UTCPublished CVE record published
2026-06-17 04:14 UTCUpdated Record last modified

ponton x\/p messenger DOWNGRADE

Affected: 3.8.0 · 3.10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 3.8.0

1. Check installed version

apt-cache policy xp-messenger || rpm -q xp-messenger || xp-messenger --version

2. No fixed release: DOWNGRADE to a release before 3.8.0 (Debian / Ubuntu)

apt-cache madison xp-messenger sudo apt install xp-messenger=<VERSION_BEFORE_3.8.0> sudo apt-mark hold xp-messenger

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

dnf --showduplicates list xp-messenger sudo dnf downgrade xp-messenger-<VERSION_BEFORE_3.8.0> sudo dnf versionlock add xp-messenger

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-2021-45887?

x\/p messenger: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-45887 being exploited?

CVE-2021-45887 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-2021-45887 affect?

CVE-2021-45887 affects x\/p messenger. Severity is critical (CVSS 9.8). An issue was discovered in PONTON X/P Messenger before 3.11.2. Due to path traversal in private/SchemaSetUpload.do for uploaded ZIP files, an executable script can be uploaded by web application administrators, giving the attacker remote co

How urgent is CVE-2021-45887?

Priority 67/100. Critical severity; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2021-45889 MEDIUM 5.4 DOWNGRADE An issue was discovered in PONTON X/P Messenger before 3.11.2
CVE-2021-45888 MEDIUM 4.8 DOWNGRADE An issue was discovered in PONTON X/P Messenger before 3.11.2
CVE-2021-45886 HIGH 8.8 DOWNGRADE An issue was discovered in PONTON X/P Messenger before 3.11.2

References

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