CVE-2017-8862: The webupgrade function on the Cohu 3960HD does not verify the firmware upgrade files or process, allowing an

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CRITICAL 9.8REMOTEMITIGATE

CVE-2017-8862 is a critical-severity flaw (CVSS 9.8) affecting 3960hd firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The webupgrade function on the Cohu 3960HD does not verify the firmware upgrade files or process, allowing an attacker to upload a specially crafted postinstall.sh file that will be executed with "root" privileges.

Why this priority

Critical severity
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	1.5% (top 26%)
CISA exploited list	No
Weakness	CWE-434
Published	2017-11-22
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: cohuhd

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

Am I affected?

Timeline

2017-11-22 08:29 UTCPublished CVE record published
2026-06-17 01:27 UTCUpdated Record last modified

cohuhd 3960hd firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

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.

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-2017-8862?

3960hd firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2017-8862 being exploited?

CVE-2017-8862 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-2017-8862 affect?

CVE-2017-8862 affects 3960hd firmware. Severity is critical (CVSS 9.8). The webupgrade function on the Cohu 3960HD does not verify the firmware upgrade files or process, allowing an attacker to upload a specially crafted postinstall.sh file that will be executed with "root" privileges.

How urgent is CVE-2017-8862?

Priority 58/100. Critical severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2017-8864 CRITICAL 9.8 MITIGATE Client-side enforcement using JavaScript of server-side security options on the Cohu 3960HD allows an attacker
CVE-2017-8863 HIGH 7.5 MITIGATE Information disclosure of .esp source code on the Cohu 3960 allows an attacker to view sensitive information s
CVE-2017-8861 CRITICAL 9.8 MITIGATE Missing authentication for the remote configuration port 1236/tcp on the Cohu 3960HD allows an attacker to cha
CVE-2017-8860 MEDIUM 6.5 MITIGATE Information disclosure through directory listing on the Cohu 3960HD allows an attacker to view and download so

References

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