CVE-2022-40319: The LISTSERV 17 web interface allows remote attackers to conduct Insecure Direct Object References (IDOR) atta

This week

HIGH 7.5REMOTEDOWNGRADE

CVE-2022-40319 is a high-severity flaw (CVSS 7.5) affecting listserv. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The LISTSERV 17 web interface allows remote attackers to conduct Insecure Direct Object References (IDOR) attacks via a modified email address in a wa.exe URL. The impact is unauthorized modification of a victim's LISTSERV account.

Why this priority

High severity
EPSS top 6%: very likely to be exploited
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	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	7.4% (top 6%)
CISA exploited list	No
Weakness	CWE-639
Published	2023-01-17
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: lsoft

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

Am I affected?

Timeline

2023-01-17 21:15 UTCPublished CVE record published
2026-06-17 05:01 UTCUpdated Record last modified

lsoft listserv DOWNGRADE

Affected: 17.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 17.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 17.0 (Debian / Ubuntu)

apt-cache madison listserv sudo apt install listserv=<VERSION_BEFORE_17.0> sudo apt-mark hold listserv

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

dnf --showduplicates list listserv sudo dnf downgrade listserv-<VERSION_BEFORE_17.0> sudo dnf versionlock add listserv

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.

Public exploits and detection

Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.

Exploit-DB: LISTSERV 17 - Insecure Direct Object Reference (IDOR)

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-2022-40319?

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

Is CVE-2022-40319 being exploited?

CVE-2022-40319 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-2022-40319 affect?

CVE-2022-40319 affects listserv. Severity is high (CVSS 7.5). The LISTSERV 17 web interface allows remote attackers to conduct Insecure Direct Object References (IDOR) attacks via a modified email address in a wa.exe URL. The impact is unauthorized modification of a victim's LISTSERV account.

How urgent is CVE-2022-40319?

Priority 60/100. High severity; EPSS top 6%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-27641 MEDIUM 6.1 UPGRADE The REPORT (after z but before a) parameter in wa.exe in L-Soft LISTSERV 16.5 before 17 allows an attacker to
CVE-2022-39195 MEDIUM 6.1 DOWNGRADE A cross-site scripting (XSS) vulnerability in the LISTSERV 17 web interface allows remote attackers to inject

References

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