CVE-2021-43461: Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the servername parameter.

Routine

MEDIUM 5.4DOWNGRADE

CVE-2021-43461 is a medium-severity flaw (CVSS 5.4) affecting rumble mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the servername parameter.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.6% (top 52%)
CISA exploited list	No
Weakness	CWE-79
Published	2022-04-04
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: rumble mail server project

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

Am I affected?

Timeline

2022-04-04 16:15 UTCPublished CVE record published
2026-06-17 04:11 UTCUpdated Record last modified

rumble mail server project rumble mail server DOWNGRADE

Affected: 0.51.3135

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.51.3135

1. Check installed version

apt-cache policy rumble-mail-server || rpm -q rumble-mail-server || rumble-mail-server --version

2. No fixed release: DOWNGRADE to a release before 0.51.3135 (Debian / Ubuntu)

apt-cache madison rumble-mail-server sudo apt install rumble-mail-server=<VERSION_BEFORE_0.51.3135> sudo apt-mark hold rumble-mail-server

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

dnf --showduplicates list rumble-mail-server sudo dnf downgrade rumble-mail-server-<VERSION_BEFORE_0.51.3135> sudo dnf versionlock add rumble-mail-server

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-2021-43461?

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

Is CVE-2021-43461 being exploited?

CVE-2021-43461 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-2021-43461 affect?

CVE-2021-43461 affects rumble mail server. Severity is medium (CVSS 5.4). Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the servername parameter.

How urgent is CVE-2021-43461?

Priority 36/100. Public exploit reference

Related CVEs

CVE-2021-43462 MEDIUM 5.4 DOWNGRADE A Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the username parameter.
CVE-2021-43459 MEDIUM 5.4 DOWNGRADE A Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the (1) domain and (2) p
CVE-2021-43456 HIGH 7.8 DOWNGRADE An Unquoted Service Path vulnerablility exists in Rumble Mail Server 0.51.3135 via via a specially crafted fil

References

← Back to latest CVEs