Apache HTTP Server up to 2.4.63 mod_ssl improper authentication

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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5.4$0-$5k0.00

Summaryinfo

A vulnerability, which was classified as critical, has been found in Apache HTTP Server up to 2.4.63. Affected by this issue is some unknown functionality of the component mod_ssl. This manipulation causes improper authentication. The identification of this vulnerability is CVE-2025-49812. It is possible to initiate the attack remotely. There is no exploit available. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability classified as critical was found in Apache HTTP Server up to 2.4.63. Affected by this vulnerability is an unknown functionality of the component mod_ssl. The manipulation with an unknown input leads to a improper authentication vulnerability. The CWE definition for the vulnerability is CWE-287. When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In some mod_ssl configurations on Apache HTTP Server versions through to 2.4.63, an HTTP desynchronisation attack allows a man-in-the-middle attacker to hijack an HTTP session via a TLS upgrade. Only configurations using "SSLEngine optional" to enable TLS upgrades are affected. Users are recommended to upgrade to version 2.4.64, which removes support for TLS upgrade.

The weakness was shared by Robert Merget. The advisory is shared at httpd.apache.org. This vulnerability is known as CVE-2025-49812 since 06/11/2025. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/16/2025).

The vulnerability scanner Nessus provides a plugin with the ID 242028 (FreeBSD : Apache httpd -- Multiple vulnerabilities (342f2a0a-5e9b-11f0-8baa-8447094a420f)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 2.4.64 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (242028), EUVD (EUVD-2025-21016) and CERT Bund (WID-SEC-2025-1850). Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Affected

  • Xerox FreeFlow Print Server

Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.4

VulDB Base Score: 5.6
VulDB Temp Score: 5.4
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Improper authentication
CWE: CWE-287
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 242028
Nessus Name: FreeBSD : Apache httpd -- Multiple vulnerabilities (342f2a0a-5e9b-11f0-8baa-8447094a420f)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: HTTP Server 2.4.64

Timelineinfo

06/11/2025 CVE reserved
07/10/2025 +29 days Advisory disclosed
07/10/2025 +0 days VulDB entry created
08/16/2025 +37 days VulDB entry last update

Sourcesinfo

Vendor: apache.org

Advisory: httpd.apache.org
Researcher: Robert Merget
Status: Confirmed

CVE: CVE-2025-49812 (🔒)
GCVE (CVE): GCVE-0-2025-49812
GCVE (VulDB): GCVE-100-316009
EUVD: 🔒
CERT Bund: WID-SEC-2025-1850 - Xerox FreeFlow Print Server: Mehrere Schwachstellen ermöglichen nicht spezifizierten Angriff

Entryinfo

Created: 07/10/2025 19:40
Updated: 08/16/2025 23:37
Changes: 07/10/2025 19:40 (57), 07/10/2025 20:08 (1), 07/13/2025 14:09 (2), 07/29/2025 17:39 (1), 08/16/2025 23:37 (7)
Complete: 🔍
Cache ID: 216::103

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion

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