CVE-2021-43456: An Unquoted Service Path vulnerablility exists in Rumble Mail Server 0.51.3135 via via a specially crafted fil

This month

HIGH 7.8DOWNGRADE

CVE-2021-43456 is a high-severity flaw (CVSS 7.8) affecting rumble mail server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An Unquoted Service Path vulnerablility exists in Rumble Mail Server 0.51.3135 via via a specially crafted file in the RumbleService executable service path.

Why this priority

High severity
Public exploit reference

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

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.4% (top 61%)
CISA exploited list	No
Weakness	CWE-428
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 15:15 UTCPublished CVE record published
2026-06-17 04:10 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-2021-43456?

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

Is CVE-2021-43456 being exploited?

CVE-2021-43456 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-2021-43456 affect?

CVE-2021-43456 affects rumble mail server. Severity is high (CVSS 7.8). An Unquoted Service Path vulnerablility exists in Rumble Mail Server 0.51.3135 via via a specially crafted file in the RumbleService executable service path.

How urgent is CVE-2021-43456?

Priority 42/100. High severity; 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-2021-43461 MEDIUM 5.4 DOWNGRADE Cross Site Scripting (XSS) vulnerability exists in Rumble Mail Server 0.51.3135 via the servername 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

References

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