CVE-2025-49812 Details
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.
View at NVD
Exploit prediction scoring system (EPSS) score for CVE-2025-49812
EPSS (Exploit Prediction Scoring System): EPSS predicts the likelihood that a vulnerability will be exploited in the wild. A higher percentage means a greater chance of an exploit occurring. The EPSS model produces a probability score between 0 and 1 (0 and 100%).
0.2 Probability of exploitation activity being observed over the next 30 days (42st percentile)
CVSS score for CVE-2025-49812
CVSS (Common Vulnerability Scoring System): An open framework owned and managed by FIRST.Org, Inc. that assigns a numerical score from 0 to 10 to software vulnerabilities to indicate their severity.
7.4 High
Products affected by CVE-2025-49812
HTTP Server 1.0
HTTP Server 1.0.2
HTTP Server 1.1
HTTP Server 1.2
HTTP Server 1.2.2
DVE Score by Bitsight AI
DVE scores complement traditional static scoring systems like CVSS with Bitsight AI powered real-time threat intelligence and underground cyber criminal activity so that security teams can reduce alert fatigue and focus on vulnerabilities most likely to be exploited.
Low
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CVE-2025-49812 Global Footprint

Top 10 Identified Countries

Country Observations Percentage
US 2,677,444 28.73%
DE 1,207,752 12.96%
JP 568,741 6.10%
FR 510,001 5.47%
GB 364,342 3.91%
NL 362,614 3.89%
CA 246,329 2.64%
RU 241,300 2.59%
IN 206,999 2.22%
KR 195,471 2.10%

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CVE-2025-49812 Industry Footprint

Top 10 Identified Industries

*Service provider organizations (typically Technology and Telecommunications) are disproportionally represented in the results given their upstream ownership of end-user infrastructure. See our FAQs.

Industry* Observations Percentage
Technology 5,302,459 79.11%
Telecommunications 995,478 14.85%
Education 194,870 2.91%
Government/Politics 51,074 0.76%
Business Services 31,216 0.47%
Media/Entertainment 19,452 0.29%
Manufacturing 14,758 0.22%
Utilities 14,627 0.22%
Energy/Resources 13,648 0.20%
Transportation 9,265 0.14%

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