CVE-2022-22831: An issue was discovered in Servisnet Tessa 0.0.2

This week

CRITICAL 9.8REMOTEDOWNGRADE

CVE-2022-22831 is a critical-severity flaw (CVSS 9.8) affecting tessa. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

An issue was discovered in Servisnet Tessa 0.0.2. An attacker can add a new sysadmin user via a manipulation of the Authorization HTTP header.

Why this priority

Critical severity
EPSS top 4%: 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	9.8 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	11.4% (top 4%)
CISA exploited list	No
Weakness	CWE-287
Published	2022-02-06
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: servisnet

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

Am I affected?

Timeline

2022-02-06 21:15 UTCPublished CVE record published
2026-06-17 04:29 UTCUpdated Record last modified

servisnet tessa DOWNGRADE

Affected: 0.0.2

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.0.2

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 0.0.2 (Debian / Ubuntu)

apt-cache madison tessa sudo apt install tessa=<VERSION_BEFORE_0.0.2> sudo apt-mark hold tessa

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

dnf --showduplicates list tessa sudo dnf downgrade tessa-<VERSION_BEFORE_0.0.2> sudo dnf versionlock add tessa

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: Servisnet Tessa - Add sysAdmin User (Unauthenticated) (Metasploit)

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-2022-22831?

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

Is CVE-2022-22831 being exploited?

CVE-2022-22831 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-2022-22831 affect?

CVE-2022-22831 affects tessa. Severity is critical (CVSS 9.8). An issue was discovered in Servisnet Tessa 0.0.2. An attacker can add a new sysadmin user via a manipulation of the Authorization HTTP header.

How urgent is CVE-2022-22831?

Priority 68/100. Critical severity; EPSS top 4%: very likely to be exploited; Public exploit reference; Remotely exploitable, no login, no user action

Related CVEs

CVE-2022-22833 HIGH 7.5 DOWNGRADE An issue was discovered in Servisnet Tessa 0.0.2
CVE-2022-22832 CRITICAL 9.8 DOWNGRADE An issue was discovered in Servisnet Tessa 0.0.2

References

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