Integer underflow in the unlzw function in unlzw.c in gzip before 1.4 on 64-bit platforms, as used in ncompress and probably others, allows remote attackers to cause a denial of service (application crash) or possibly execute arbitrary code via a crafted archive that uses LZW compression, leading to an array index error.
Conclusion & alert: CVE-2010-0001 is rated Moderate Risk (54/100): CVSS Medium severity, with high exploitation likelihood (EPSS 4.77%, 91th 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 | 2026-06-15 | 27.07% | 4.77% | -22.30% |
| 2 | 2026-06-13 | 22.60% | 27.07% | +4.47% |
| 3 | 2026-02-05 | — | 22.60% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 6.8 | 2.0 | MEDIUM |
|
8.6 | 6.4 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
debian
|
medium | CVE-2010-0001 medium priority: Debian including 5 source packages (busybox, gzip, klibc, ncompress, pristine-tar), 25 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 25. | https://security-tracker.debian.org/tracker/CVE-2010-0001 |
gentoo
|
high | CVE-2010-0001: 1 GLSA(s) (201412-08), 27 atom(s) (app-antivirus/bitdefender-console, app-arch/gzip, …); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2010-0001 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2010-0001 |
suse
|
high | CVE-2010-0001 severity important: SUSE including 12 source package names (gzip-1.10-2.12, gzip-1.13-1.50, …), 27 product×package rows across 27 product lines (SUSE Linux Enterprise Desktop 12, SUSE Linux Enterprise Desktop 12 SP1, … (27 product lines)): Fixed 27. | https://www.suse.com/security/cve/CVE-2010-0001/ |
ubuntu
|
medium | CVE-2010-0001 medium priority: Ubuntu including 1 source packages (gzip), 6 status rows across 6 suites (dapper, hardy, intrepid, jaunty, karmic, upstream): released 6. | https://ubuntu.com/security/CVE-2010-0001 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| gnu | gzip | <= 1.3.13 | cpe:2.3:a:gnu:gzip:*:*:*:*:*:*:*:* |
| gnu | gzip | 1.2.4 | cpe:2.3:a:gnu:gzip:1.2.4:*:*:*:*:*:*:* |
| gnu | gzip | 1.2.4a | cpe:2.3:a:gnu:gzip:1.2.4a:*:*:*:*:*:*:* |
| gnu | gzip | 1.3 | cpe:2.3:a:gnu:gzip:1.3:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.1 | cpe:2.3:a:gnu:gzip:1.3.1:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.2 | cpe:2.3:a:gnu:gzip:1.3.2:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.3 | cpe:2.3:a:gnu:gzip:1.3.3:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.4 | cpe:2.3:a:gnu:gzip:1.3.4:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.5 | cpe:2.3:a:gnu:gzip:1.3.5:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.6 | cpe:2.3:a:gnu:gzip:1.3.6:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.7 | cpe:2.3:a:gnu:gzip:1.3.7:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.8 | cpe:2.3:a:gnu:gzip:1.3.8:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.9 | cpe:2.3:a:gnu:gzip:1.3.9:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.10 | cpe:2.3:a:gnu:gzip:1.3.10:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.11 | cpe:2.3:a:gnu:gzip:1.3.11:*:*:*:*:*:*:* |
| gnu | gzip | 1.3.12 | cpe:2.3:a:gnu:gzip:1.3.12:*:*:*:*:*:*:* |