The date handling code in modules/proxy/proxy_util.c (mod_proxy) in Apache 2.3.0, when using a threaded MPM, allows remote origin servers to cause a denial of service (caching forward proxy process crash) via crafted date headers that trigger a buffer over-read.
Conclusion & alert: CVE-2007-3847 is rated Moderate Risk (54.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 23.28%, 96th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. Mandatory action: High exploitation likelihood—assess exposure and prioritize remediation.
Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.
EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).
| # | Date | Old EPSS score | New EPSS score | Delta (New - Old) |
|---|---|---|---|---|
| 1 | 2026-04-11 | 22.61% | 23.28% | +0.67% |
| 2 | 2025-12-29 | 22.13% | 22.61% | +0.48% |
| 3 | 2025-12-28 | — | 22.13% | — |
Full EPSS history (27 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 5.0 | 2.0 | MEDIUM |
|
10.0 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
low | CVE-2007-3847 low priority: Debian including 1 source packages (apache2), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2007-3847 |
gentoo
|
normal | CVE-2007-3847: 1 GLSA(s) (200711-06), 1 atom(s) (www-servers/apache); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-3847 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2007-3847 |
suse
|
medium | CVE-2007-3847 severity moderate: SUSE including 33 source package names (apache2-2.2.10-2.24.5, apache2-2.2.12-1.28.1, …), 39 product×package rows across 7 product lines (SUSE Linux Enterprise Server 11 SP1, SUSE Linux Enterprise Server 11 SP2, … (7 product lines)): Fixed 39. | https://www.suse.com/security/cve/CVE-2007-3847/ |
ubuntu
|
low | CVE-2007-3847 low priority: Ubuntu including 1 source packages (apache2), 5 status rows across 5 suites (dapper, edgy, feisty, gutsy, upstream): released 4, needs-triage 1. | https://ubuntu.com/security/CVE-2007-3847 |
Fixed in Apache HTTP Server 2.2.6 and 2.0.61: http://httpd.apache.org/security/vulnerabilities_22.html http://httpd.apache.org/security/vulnerabilities_20.html
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| apache | http_server | >= 2.0.35, < 2.0.61 | cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* |
| apache | http_server | >= 2.2.0, < 2.2.6 | cpe:2.3:a:apache:http_server:*:*:*:*:*:*:*:* |
| fedoraproject | fedora | 7 | cpe:2.3:o:fedoraproject:fedora:7:*:*:*:*:*:*:* |
| fedoraproject | fedora_core | 6 | cpe:2.3:o:fedoraproject:fedora_core:6:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 6.06 | cpe:2.3:o:canonical:ubuntu_linux:6.06:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 6.10 | cpe:2.3:o:canonical:ubuntu_linux:6.10:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 7.04 | cpe:2.3:o:canonical:ubuntu_linux:7.04:*:*:*:*:*:*:* |
| canonical | ubuntu_linux | 7.10 | cpe:2.3:o:canonical:ubuntu_linux:7.10:*:*:*:*:*:*:* |