CVE-2018-5704: Open On-Chip Debugger (OpenOCD) 0.10.0 does not block attempts to use HTTP POST for sending data to 127.0.0.1

This week

CRITICAL 9.6WATCHLISTMITIGATEDOWNGRADE

CVE-2018-5704 is a critical-severity flaw (CVSS 9.6) affecting debian linux, open on-chip debugger. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Open On-Chip Debugger (OpenOCD) 0.10.0 does not block attempts to use HTTP POST for sending data to 127.0.0.1 port 4444, which allows remote attackers to conduct cross-protocol scripting attacks, and consequently execute arbitrary commands, via a crafted web site.

Why this priority

Critical severity
EPSS top 8%: very likely to be exploited
Public exploit reference
On your watchlist

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

Risk facts

CVSS score	9.6 (Critical)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	4.6% (top 8%)
CISA exploited list	No
Weakness	CWE-134
Published	2018-01-16
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: debian · openocd

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

Am I affected?

Timeline

2018-01-16 09:29 UTCPublished CVE record published
2026-06-17 02:00 UTCUpdated Record last modified

debian debian linux MITIGATE

Affected: 8.0 · 9.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 8.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

openocd open on-chip debugger DOWNGRADE

Affected: 0.10.0

Fixed in: no fixed release known

Safe to downgrade to: a release before 0.10.0

1. Check installed version

apt-cache policy open-on-chip-debugger || rpm -q open-on-chip-debugger || open-on-chip-debugger --version

2. No fixed release: DOWNGRADE to a release before 0.10.0 (Debian / Ubuntu)

apt-cache madison open-on-chip-debugger sudo apt install open-on-chip-debugger=<VERSION_BEFORE_0.10.0> sudo apt-mark hold open-on-chip-debugger

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

dnf --showduplicates list open-on-chip-debugger sudo dnf downgrade open-on-chip-debugger-<VERSION_BEFORE_0.10.0> sudo dnf versionlock add open-on-chip-debugger

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-2018-5704?

debian linux: mitigate or apply the listed mitigation; open on-chip debugger: downgrade or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2018-5704 being exploited?

CVE-2018-5704 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-2018-5704 affect?

CVE-2018-5704 affects debian linux, open on-chip debugger. Severity is critical (CVSS 9.6). Open On-Chip Debugger (OpenOCD) 0.10.0 does not block attempts to use HTTP POST for sending data to 127.0.0.1 port 4444, which allows remote attackers to conduct cross-protocol scripting attacks, and consequently execute arbitrary commands,

How urgent is CVE-2018-5704?

Priority 67/100. Critical severity; EPSS top 8%: very likely to be exploited; Public exploit reference; On your watchlist

Software pages

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References

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