CVE-2006-4573

Multiple unspecified vulnerabilities in the "utf8 combining characters handling" (utf8_handle_comb function in encoding.c) in screen before 4.0.3 allows user-assisted attackers to cause a denial of service (crash or hang) via certain UTF8 sequences.

Published: 2006-10-24 Last update: 2026-04-23 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2006-4573 is rated Low Risk (39/100): CVSS Low severity, with medium exploitation likelihood (EPSS 2.10%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2006-4573

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 1.22% 2.10% +0.88%
2 2026-05-03 1.02% 1.22% +0.20%
3 2026-04-28 — 1.02% —

Full EPSS history (17 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2006-4573

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
2.6 2.0 LOW
AV:N/AC:H/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:H)
Exploitation requires uncommon or highly specific conditions.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 4.9 2.9 [email protected]

Weakness enumeration for CVE-2006-4573

OS Trackers for CVE-2006-4573

vendor priority summary link
alpine — CVE-2006-4573: no source package rows; 0 state rows across 0 repos (none); fixed 0, open 0. https://security.alpinelinux.org/vuln/CVE-2006-4573
debian medium CVE-2006-4573 medium priority: Debian including 1 source packages (screen), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. https://security-tracker.debian.org/tracker/CVE-2006-4573
gentoo high CVE-2006-4573: 1 GLSA(s) (200611-01), 1 atom(s) (app-misc/screen); latest impact high. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2006-4573
redhat low — https://access.redhat.com/security/cve/CVE-2006-4573
ubuntu medium CVE-2006-4573 medium priority: Ubuntu including 1 source packages (screen), 4 status rows across 4 suites (dapper, edgy, feisty, upstream): released 3, needs-triage 1. https://ubuntu.com/security/CVE-2006-4573

Affected software / configurations for CVE-2006-4573

Vendor Product Version Raw CPE
gnu screen <= 4.0.2 cpe:2.3:a:gnu:screen:*:*:*:*:*:*:*:*

References for CVE-2006-4573

URL Tags
http://docs.info.apple.com/article.html?artnum=305530
http://lists.apple.com/archives/security-announce/2007/May/msg00004.html
http://lists.gnu.org/archive/html/screen-users/2006-10/msg00028.html Patch
http://secunia.com/advisories/22573
http://secunia.com/advisories/22583
http://secunia.com/advisories/22611
http://secunia.com/advisories/22647
http://secunia.com/advisories/22649
http://secunia.com/advisories/22707
http://secunia.com/advisories/22726
http://secunia.com/advisories/25402
http://security.gentoo.org/glsa/glsa-200611-01.xml
http://slackware.com/security/viewer.php?l=slackware-security&y=2006&m=slackware-security.480775
http://www.debian.org/security/2006/dsa-1202
http://www.mandriva.com/security/advisories?name=MDKSA-2006:191
http://www.openpkg.org/security/advisories/OpenPKG-SA-2006.026-screen.html
http://www.securityfocus.com/bid/20727
http://www.ubuntu.com/usn/usn-370-1
http://www.vupen.com/english/advisories/2006/4189
http://www.vupen.com/english/advisories/2007/1939
https://issues.rpath.com/browse/RPL-734
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