CVE-2017-5593: An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker t

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MEDIUM 5.9REMOTEDOWNGRADE

CVE-2017-5593 is a medium-severity flaw (CVSS 5.9) affecting psi\+. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engineering attacks. This CVE is for Psi+ (0.16.563.580 - 0.16.571.627).

Why this priority

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	5.9 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.7% (top 48%)
CISA exploited list	No
Weakness	CWE-20, CWE-346
Published	2017-02-09
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: psi-plus

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

Am I affected?

Timeline

2017-02-09 20:59 UTCPublished CVE record published
2026-06-17 01:20 UTCUpdated Record last modified

psi-plus psi\+ DOWNGRADE

Affected: 0.16.563.580 · 0.16.571.627

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.16.563.580

1. Check installed version

apt-cache policy psi+ || rpm -q psi+ || psi+ --version

2. No fixed release: DOWNGRADE to a release before 0.16.563.580 (Debian / Ubuntu)

apt-cache madison psi+ sudo apt install psi+=<VERSION_BEFORE_0.16.563.580> sudo apt-mark hold psi+

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

dnf --showduplicates list psi+ sudo dnf downgrade psi+-<VERSION_BEFORE_0.16.563.580> sudo dnf versionlock add psi+

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-2017-5593?

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

Is CVE-2017-5593 being exploited?

CVE-2017-5593 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-2017-5593 affect?

CVE-2017-5593 affects psi\+. Severity is medium (CVSS 5.9). An incorrect implementation of "XEP-0280: Message Carbons" in multiple XMPP clients allows a remote attacker to impersonate any user, including contacts, in the vulnerable application's display. This allows for various kinds of social engin

How urgent is CVE-2017-5593?

Priority 44/100. Public exploit reference; Remotely exploitable, no login, no user action

References

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