CVE-2025-49812
published 2025-07-10CVE-2025-49812: 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…
high7.4CVSS 3.1
AVNACHPRNUINSUCHIHAN
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.
Affected
8 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| apache | http_server | < 2.4.64 | 2.4.64 |
| apache_software_foundation | apache_http_server | <= 2.4.63 | — |
| debian | apache2 | < apache2 2.4.65-1~deb12u1 (bookworm) | apache2 2.4.65-1~deb12u1 (bookworm) |
| msrc | azl3_httpd_2.4.62-1_on_azure_linux_3.0 | — | — |
| msrc | azl3_httpd_2.4.64-1_on_azure_linux_3.0 | — | — |
| msrc | cbl2_httpd_2.4.62-1_on_cbl_mariner_2.0 | — | — |
| msrc | cbl2_httpd_2.4.64-1_on_cbl_mariner_2.0 | — | — |
| ubuntu | apache2 | — | — |
CVSS provenance
nvdv3.17.4HIGHCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
osv7.5HIGH