CVE-2019-19557: A misconfiguration in the debug interface in Mercedes-Benz HERMES 1 allows an attacker with direct physical ac

Routine

LOW 2.4DOWNGRADE

CVE-2019-19557 is a low-severity flaw (CVSS 2.4) affecting hermes. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A misconfiguration in the debug interface in Mercedes-Benz HERMES 1 allows an attacker with direct physical access to device hardware to obtain cellular modem information.

Why this priority

Public exploit reference

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

Risk facts

CVSS score	2.4 (Low)
Attack vector	Physical
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 63%)
CISA exploited list	No
Weakness	CWE-922
Published	2020-11-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: harman

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

Am I affected?

Timeline

2020-11-16 00:15 UTCPublished CVE record published
2026-06-17 02:26 UTCUpdated Record last modified

harman hermes DOWNGRADE

Affected: 1.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 1.0

1. Check installed version

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

2. No fixed release: DOWNGRADE to a release before 1.0 (Debian / Ubuntu)

apt-cache madison hermes sudo apt install hermes=<VERSION_BEFORE_1.0> sudo apt-mark hold hermes

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

dnf --showduplicates list hermes sudo dnf downgrade hermes-<VERSION_BEFORE_1.0> sudo dnf versionlock add hermes

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-2019-19557?

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

Is CVE-2019-19557 being exploited?

CVE-2019-19557 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-2019-19557 affect?

CVE-2019-19557 affects hermes. Severity is low (CVSS 2.4). A misconfiguration in the debug interface in Mercedes-Benz HERMES 1 allows an attacker with direct physical access to device hardware to obtain cellular modem information.

How urgent is CVE-2019-19557?

Priority 23/100. Public exploit reference

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References

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