archive_read_support_format_tar.c in libarchive before 2.2.4 allows user-assisted remote attackers to cause a denial of service (infinite loop) via (1) an end-of-file condition within a pax extension header or (2) a malformed pax extension header in an (a) PAX or a (b) TAR archive.
Conclusion & alert: CVE-2007-3644 is rated Moderate Risk (50.6/100): CVSS Medium severity, with high exploitation likelihood (EPSS 13.90%, 94th 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 | 2026-03-02 | 13.44% | 13.90% | +0.46% |
| 2 | 2025-05-07 | 18.82% | 13.44% | -5.38% |
| 3 | 2025-05-05 | — | 18.82% | — |
Full EPSS history (14 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 4.3 | 2.0 | MEDIUM |
|
8.6 | 2.9 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
low | CVE-2007-3644 low priority: Debian including 1 source packages (libarchive), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2007-3644 |
gentoo
|
normal | CVE-2007-3644: 1 GLSA(s) (200708-03), 1 atom(s) (app-arch/libarchive); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2007-3644 |
suse
|
medium | CVE-2007-3644 severity moderate: SUSE including 7 source package names (bsdtar-3.8.1-160000.2.2, libarchive-devel-2.5.5-5.19, …), 10 product×package rows across 8 product lines (SUSE Linux Enterprise Server 11 SP1, SUSE Linux Enterprise Server 11 SP2, … (8 product lines)): Fixed 10. | https://www.suse.com/security/cve/CVE-2007-3644/ |
ubuntu
|
medium | CVE-2007-3644 medium priority: Ubuntu including 1 source packages (libarchive), 9 status rows across 9 suites (dapper, edgy, feisty, gutsy, hardy, intrepid, jaunty, karmic, upstream): released 5, ignored 3, needs-triage 1. | https://ubuntu.com/security/CVE-2007-3644 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| freebsd | libarchive | <= 2.2.3 | cpe:2.3:a:freebsd:libarchive:*:*:*:*:*:*:*:* |