HOME VULNERABILITIESCVE-2025-6533

MEDIUM

CVE-2025-6533

CWE-287Published: June 24, 2025· Updated: Jun 17, 2026

5.9

CVSS v3.1

Official Description

A vulnerability, which was classified as critical, has been found in xxyopen/201206030 novel-plus up to 5.1.3. Affected by this issue is the function ajaxLogin of the file novel-admin/src/main/java/com/java2nb/system/controller/LoginController.java of the component CATCHA Handler. The manipulation leads to authentication bypass by capture-replay. The attack may be launched remotely. The complexity of an attack is rather high. The exploitation is known to be difficult. The exploit has been disclosed to the public and may be used. The vendor was contacted early about this disclosure but did not respond in any way.

Technical Analysis

CVE-2025-6533 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in full integrity compromise (data manipulation), with a CVSS base score of 5.9.

From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.

CVSS v3.1 Vector Breakdown

Exploitability

Attack VectorNetwork

Attack ComplexityHigh

Privileges Req.None

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N

Affected Vendors & Products

xxyopen1 product(s)

novel-plus

Source: NVD CPE · 1 total CPE entries

Exploit & PoC Resources

NO KNOWN EXPLOITNo public exploit confirmed at this time

Offensive Security exploit database

GitHub PoC Search

Community PoC repositories

Rapid7 / Metasploit

Metasploit module search

Security advisories & exploits

Official NIST entry

CVE Program entry

External links open in a new tab. Always verify in a controlled environment before use.

Official Patches & Advisories

ADVISORYhttps://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass

ADVISORYhttps://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass#poc

ADVISORYhttps://vuldb.com/?id.313652

ADVISORYhttps://vuldb.com/?submit.596481

ADVISORYhttps://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass

All References (6)

→

https://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypassExploit · Third Party Advisory

→

https://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypass#pocExploit · Third Party Advisory

→

https://vuldb.com/?ctiid.313652Permissions Required · VDB Entry

→

https://vuldb.com/?id.313652Third Party Advisory · VDB Entry

→

https://vuldb.com/?submit.596481Third Party Advisory · VDB Entry

→

https://blog.0xd00.com/blog/captcha-replay-attack-lead-to-brute-force-protection-bypassExploit · Third Party Advisory

Quick Facts

CVE IDCVE-2025-6533

CVSS Score5.9 / 10

SeverityMEDIUM

WeaknessCWE-287

CISA KEVNo

Affected1 vendor(s)

PublishedJun 24, 2025

Related CVEs (CWE-287)

Recommended Actions

→Apply vendor patches immediately
→Monitor CVE-2025-6533 in threat intel feeds
→Review IDS/IPS signatures for exploitation attempts

Data sourced from NVD (NIST), CISA KEV, and EPSS (FIRST). Analysis generated by CTIWatch. CVE data is provided under the NVD usage policy.

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