NVD / CVE Program· CNA apache

CVE-2025-49812: Apache HTTP Server: mod_ssl TLS upgrade attack

Noroxi assessment

Priority: Monitor (action score 29/100)

Public proof-of-concept code exists (GitHub); there is no record of exploitation in the wild.
Probability of exploitation in the next 30 days: 0.74% (FIRST EPSS); higher than 55.2% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. Special conditions such as timing or configuration are required.
Fixed version: Apache Software Foundation Apache HTTP Server 2.4.64; azl3 httpd 2.4.62-1 on Azure Linux 3.0 2.4.64-1; azl3 httpd 2.4.64-1 on Azure Linux 3.0 2.4.64-1.

Low priority for now. Upgrade to Apache Software Foundation Apache HTTP Server 2.4.64; azl3 httpd 2.4.62-1 on Azure Linux 3.0 2.4.64-1; azl3 httpd 2.4.64-1 on Azure Linux 3.0 2.4.64-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.4 · v3.1—Proof of concept Fix available

Published: Jul 10, 2025
Updated: Jun 17, 2026
EPSS: 0.7% · 55th percentile
CWE: CWE-287

Report tools

JSON

Action score

Monitor

Low priority for now.

CVSS: 29 / 40 · 7.4 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.7%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: total

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

Not in KEV: no record of exploitation in the wild
Proof of concept exists, no weaponized module
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
apache	http server	cpe:2.3:a:apache:http_server

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Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

apache http serverbefore 2.4.64

Versions reported by the vendor

Affected version ranges reported by the assigning authority (apache). Independent of NVD's CPE analysis and usually ahead of it.

Apache Software Foundation Apache HTTP Server
- up to and including 2.4.63affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

Ecosystem	Package	Affected range	Fix
AlmaLinux:10	httpd-filesystem	before 2.4.63-1.el10_0.2	2.4.63-1.el10_0.2
AlmaLinux:10	httpd-manual	before 2.4.63-1.el10_0.2	2.4.63-1.el10_0.2
AlmaLinux:8	httpd	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	httpd-devel	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	httpd-filesystem	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	httpd-manual	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	httpd-tools	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	mod_http2	before 1.15.7-10.module_el8.10.0+4044+ea5f78b1.4	1.15.7-10.module_el8.10.0+4044+ea5f78b1.4
AlmaLinux:8	mod_ldap	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	mod_md	before 1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa	1:2.0.8-8.module_el8.6.0+2872+fe0ff7aa
AlmaLinux:8	mod_md	before 1:2.0.8-8.module_el8.6.0+3031+fb177b09	1:2.0.8-8.module_el8.6.0+3031+fb177b09
AlmaLinux:8	mod_proxy_html	before 1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	mod_session	before 2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:8	mod_ssl	before 1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5	1:2.4.37-65.module_el8.10.0+4044+ea5f78b1.5
AlmaLinux:9	httpd	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	httpd-core	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	httpd-devel	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	httpd-filesystem	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	httpd-manual	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	httpd-tools	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	mod_ldap	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	mod_lua	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4
AlmaLinux:9	mod_proxy_html	before 1:2.4.62-4.el9_6.4	1:2.4.62-4.el9_6.4
AlmaLinux:9	mod_session	before 2.4.62-4.el9_6.4	2.4.62-4.el9_6.4

+96

Same product

apache: all records

Other highest-scoring records for the same primary product.

CVE-2021-42013Path Traversal and Remote Code Execution in Apache HTTP Server 2.4.49 and 2.4.50 (incomplete fix of CVE-2021-41773)KEV
99Now
CVE-2021-41773Path traversal and file disclosure vulnerability in Apache HTTP Server 2.4.49KEV
99Now
CVE-2024-38475Apache HTTP Server weakness in mod_rewrite when first segment of substitution matches filesystem path.KEV
96Now

Published before and after this one in the same product

← EarlierCVE-2025-23048Jul 10, 2025 · Apache HTTP Server: mod_ssl access control bypass with session resumption
36Monitor
← EarlierCVE-2025-49630Jul 10, 2025 · Apache HTTP Server: mod_proxy_http2 denial of service
30Monitor
Later →CVE-2025-53020Jul 10, 2025 · Apache HTTP Server: HTTP/2 DoS by Memory Increase
31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Apache Software Foundation Apache HTTP Server	2.4.64 · description	Vendor (CNA)
azl3 httpd 2.4.62-1 on Azure Linux 3.0	2.4.64-1 · CBL-Mariner Releases	Microsoft (MSRC)
azl3 httpd 2.4.64-1 on Azure Linux 3.0	2.4.64-1 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 httpd 2.4.62-1 on CBL Mariner 2.0	2.4.64-1 · CBL-Mariner Releases	Microsoft (MSRC)
cbl2 httpd 2.4.64-1 on CBL Mariner 2.0	2.4.64-1 · CBL-Mariner Releases	Microsoft (MSRC)
almalinux:httpd	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:httpd-core	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:httpd-devel	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:httpd-filesystem	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:httpd-manual	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:httpd-tools	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:mod_http2	1.15.7-10.module_el8.10.0+4044+ea5f78b1.4 · AlmaLinux:8	Package registry (OSV)
almalinux:mod_ldap	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:mod_lua	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:mod_proxy_html	1:2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:mod_session	2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
almalinux:mod_ssl	1:2.4.62-4.el9_6.4 · AlmaLinux:9	Package registry (OSV)
alpine:apache2	2.4.64-r0 · Alpine:v3.19	Package registry (OSV)
debian:apache2	2.4.65-1~deb12u1 · Debian:12	Package registry (OSV)
opensuse:apache2	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:apache2-devel	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:apache2-event	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:apache2-manual	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:apache2-prefork	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:apache2-utils	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:apache2-worker	2.4.58-150600.5.35.1 · openSUSE:Leap 15.6	Package registry (OSV)
opensuse:cyrus-imapd	3.8.6-1.1 · openSUSE:Tumbleweed	Package registry (OSV)
red hat:jbcs-httpd24-httpd	0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7	Package registry (OSV)
red hat:jbcs-httpd24-httpd-debuginfo	0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7	Package registry (OSV)
red hat:jbcs-httpd24-httpd-devel	0:2.4.62-8.el7jbcs · Red Hat:jboss_core_services:1::el7	Package registry (OSV)

+20

Exploit status

Proof of concept available

A public proof of concept or detection signature exists. Exploit knowledge is out there; don't delay patching.

Evidence

Proof-of-concept repository on GitHub ×1

Noroxi does not host or link to exploit code. Metasploit module names and Nuclei template ids are shown (names, not code); Exploit-DB entries and PoC repositories are given as counts only.

Public exploit evidence
Source	Kind	Date
Proof-of-concept repository on GitHub	stars:0	2026-10-18

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedJul 10, 2025
First PoCOct 18, 2026+464 d
TodayNov 11, 2026+489 d

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
Special conditions such as timing or configuration are required.

If successful

Confidentiality: high · data can be read
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: High
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: High
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-287 · Improper Authentication

CVSS vector

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

nvd-secondary

Root cause

Authentication is added route by route instead of being enforced in one place. When a route added later bypasses the shared middleware, the session check never runs for it.

The bug in code

The whole CWE-287 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1app.use("/admin", requireSession, adminRouter);
2

3// Route added later skips the middleware
4app.post("/admin-api/config", updateConfig);

Fixed

1const admin = express.Router();
2admin.use(requireSession, requireRole("admin"));
3

4admin.post("/config", updateConfig);
5app.use("/admin", admin);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

Change log

Exploit maturitynone → pocOct 19, 2026, 3:36 AM UTC
Fix✗ → ✓Sep 28, 2026, 10:08 PM UTC

For records you follow, these changes also arrive as notifications. →

References

httpd.apache.org/security/vulnerabilities_24.html

Show all references (4 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Noroxi analysis

What does it mean in your environment?

We use this product, ask for help

Data sources and verification

CNA: apache

CVE.org (CNA)Nov 4, 2025, 9:11 PM UTC
CISA ADPNov 4, 2025, 9:11 PM UTC
NVDJun 17, 2026, 5:31 AM UTC
FIRST EPSSNov 10, 2026, 12:00 AM UTC
OSV / GHSANov 11, 2026, 3:18 AM UTC
MSRCOct 2, 2026, 3:23 AM UTC
PoC-in-GitHubNov 11, 2026, 3:18 AM UTC

Each line is when that source was last processed for this record.

CVE-2025-49812: Apache HTTP Server: mod_ssl TLS upgrade attack

Noroxi assessment

Get told when this record changes

Follow CVE-2025-49812

What does it mean in your environment?

Affected systems

Is your version affected?

Watch new CVEs for http server

Affected versions

Versions reported by the vendor

Package-level exposure

Same product

Remediation

Which version to upgrade to

Exploit status

Research context

Timeline

Patch and commit links

Credits

Variant candidates

Chain candidates

Technical details

Attack conditions

If successful

Root cause

The bug in code

Attack context

Change log

References