CVE-2023-49259: The authentication cookies are generated using an algorithm based on the username, hardcoded secret and the up

Q: How do I fix CVE-2023-49259?

h8951-4g-esp firmware: upgrade to 2310271149. Exact commands for each OS are on this page.

Q: Is CVE-2023-49259 being exploited?

CVE-2023-49259 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2023-49259 affect?

CVE-2023-49259 affects h8951-4g-esp firmware. Severity is high (CVSS 7.5). The authentication cookies are generated using an algorithm based on the username, hardcoded secret and the up-time, and can be guessed in a reasonable time.

Q: How urgent is CVE-2023-49259?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Routine

HIGH 7.5REMOTEUPGRADE

CVE-2023-49259 is a high-severity flaw (CVSS 7.5) affecting h8951-4g-esp firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

The authentication cookies are generated using an algorithm based on the username, hardcoded secret and the up-time, and can be guessed in a reasonable time.

Why this priority

High severity
Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 77%)
CISA exploited list	No
Weakness	CWE-341, CWE-327
Published	2024-01-12
Last modified	2026-06-17

Publisher (CNA): CERT.PL · Vendor: hongdian

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

Am I affected?

Timeline

2024-01-12 15:15 UTCPublished CVE record published
2026-06-17 06:35 UTCUpdated Record last modified

hongdian h8951-4g-esp firmware UPGRADE

Affected: < 2310271149

Fixed in: 2310271149

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-2023-49259?

h8951-4g-esp firmware: upgrade to 2310271149. Exact commands for each OS are on this page.

Is CVE-2023-49259 being exploited?

CVE-2023-49259 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-2023-49259 affect?

CVE-2023-49259 affects h8951-4g-esp firmware. Severity is high (CVSS 7.5). The authentication cookies are generated using an algorithm based on the username, hardcoded secret and the up-time, and can be guessed in a reasonable time.

How urgent is CVE-2023-49259?

Priority 37/100. High severity; Remotely exploitable, no login, no user action

Related CVEs

CVE-2023-49262 CRITICAL 9.8 UPGRADE The authentication mechanism can be bypassed by overflowing the value of the Cookie "authentication" field, pr
CVE-2023-49261 HIGH 7.5 UPGRADE The "tokenKey" value used in user authorization is visible in the HTML source of the login page.
CVE-2023-49260 MEDIUM 6.1 UPGRADE An XSS attack can be performed by changing the MOTD banner and pointing the victim to the "terminal_tool.cgi"
CVE-2023-49258 MEDIUM 6.1 UPGRADE User browser may be forced to execute JavaScript and pass the authentication cookie to the attacker leveraging
CVE-2023-49257 HIGH 8.8 UPGRADE An authenticated user is able to upload an arbitrary CGI-compatible file using the certificate upload utility

References

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