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CVE-2004-1540

30
FAUCET Score

CVE-2004-1540 describes an authentication bypass vulnerability in ZyXEL Prestige 623, 650, and 652 HW Routers, and potentially other versions, when HTTP Remote Administration is enabled. This flaw allows unauthenticated remote attackers to access the rpFWUpload.html page without a password, enabling them to reset the router's configuration. The vulnerability has a CVSS score of 5.0, indicating a medium severity with a network attack vector, low attack complexity, and potential for partial impact on integrity. While not listed in CISA's KEV catalog, an ExploitDB entry exists, and the vulnerability has garnered significant community discussion, suggesting awareness and potential for exploitation.

Impacted Technologies

VendorProductVersion(s)CPE
645r_a1CPE matchmatch criteria
cpe:2.3:h:zyxel:prestige:645r_a1:*:*:*:*:*:*:*
650hCPE matchmatch criteria
cpe:2.3:h:zyxel:prestige:650h:*:*:*:*:*:*:*
650hwCPE matchmatch criteria
cpe:2.3:h:zyxel:prestige:650hw:*:*:*:*:*:*:*
650hw_31CPE matchmatch criteria
cpe:2.3:h:zyxel:prestige:650hw_31:*:*:*:*:*:*:*
650rCPE matchmatch criteria
cpe:2.3:h:zyxel:prestige:650r:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 2.0

5.0MEDIUM

AV:N/AC:L/Au:N/C:N/I:P/A:N

Confidentiality Impact
NONE
Integrity Impact
PARTIAL
Availability Impact
NONE
Access Vector
NETWORK
Access Complexity
LOW
Authentication
NONE
Exploitability Score
10.0
Impact Score
2.9
CvssVersion
2.0

Exploit Intelligence

EPSS Score
6.57%
Probability of exploitation in next 30 days
EPSS Percentile
93.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-24760 · Nov 22, 2004
This CVE's current EPSS score of 0.0657 is in the 90th percentile among its peer group of 23,705 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

marc.info
marc.info
secunia.com / advisories/13278
Vendor Advisory
securitytracker.com / id
Exploit
exchange.xforce.ibmcloud.com / vulnerabilities/18202
osvdb.org / 12108
securityfocus.com / bid/11723
Exploit