Multiple buffer overflows in plugins/imageformats/ico/qicohandler.cpp in the QtBase module in Qt before 4.8.7 and 5.x before 5.4.2 allow remote attackers to cause a denial of service (segmentation fault and crash) and possibly execute arbitrary code via a crafted ICO image.
Conclusion & alert: CVE-2015-1859 is rated Moderate Risk (62.7/100): CVSS Medium severity, with high exploitation likelihood (EPSS 7.19%, 93th percentile). Core evidence: EPSS ranks this CVE among the most likely to be exploited in the near term. EPSS rose +2.79% over the last day, indicating growing attacker interest. 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 | 4.40% | 7.19% | +2.79% |
| 2 | 2025-07-13 | 2.94% | 4.40% | +1.45% |
| 3 | 2025-05-11 | — | 2.94% | — |
Full EPSS history (10 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
|
not yet assigned | CVE-2015-1859 not yet assigned priority: Debian including 1 source packages (qtbase-opensource-src), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5. | https://security-tracker.debian.org/tracker/CVE-2015-1859 |
gentoo
|
normal | CVE-2015-1859: 1 GLSA(s) (201603-10), 1 atom(s) (dev-qt/qtgui); latest impact normal. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2015-1859 |
redhat
|
medium | — | https://access.redhat.com/security/cve/CVE-2015-1859 |
ubuntu
|
low | CVE-2015-1859 low priority: Ubuntu including 2 source packages (qt4-x11, qtbase-opensource-src), 12 status rows across 6 suites (lucid, precise, trusty, upstream, utopic, vivid): released 7, DNE 2, needs-triage 2, ignored 1. | https://ubuntu.com/security/CVE-2015-1859 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| fedoraproject | fedora | 20 | cpe:2.3:o:fedoraproject:fedora:20:*:*:*:*:*:*:* |
| fedoraproject | fedora | 21 | cpe:2.3:o:fedoraproject:fedora:21:*:*:*:*:*:*:* |
| fedoraproject | fedora | 22 | cpe:2.3:o:fedoraproject:fedora:22:*:*:*:*:*:*:* |
| digia | qt | <= 4.8.6 | cpe:2.3:a:digia:qt:*:*:*:*:*:*:*:* |
| qt | qt | 5.0.0 | cpe:2.3:a:qt:qt:5.0.0:*:*:*:*:*:*:* |
| qt | qt | 5.0.1 | cpe:2.3:a:qt:qt:5.0.1:*:*:*:*:*:*:* |
| qt | qt | 5.0.2 | cpe:2.3:a:qt:qt:5.0.2:*:*:*:*:*:*:* |
| qt | qt | 5.1.0 | cpe:2.3:a:qt:qt:5.1.0:*:*:*:*:*:*:* |
| qt | qt | 5.2.0 | cpe:2.3:a:qt:qt:5.2.0:*:*:*:*:*:*:* |
| qt | qt | 5.2.1 | cpe:2.3:a:qt:qt:5.2.1:*:*:*:*:*:*:* |
| qt | qt | 5.3.0 | cpe:2.3:a:qt:qt:5.3.0:*:*:*:*:*:*:* |
| qt | qt | 5.4.1 | cpe:2.3:a:qt:qt:5.4.1:*:*:*:*:*:*:* |
| URL | Tags |
|---|---|
| http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155424.html | Third Party Advisory |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155927.html | Patch Third Party Advisory |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155962.html | Third Party Advisory |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-April/155976.html | Third Party Advisory |
| http://lists.fedoraproject.org/pipermail/package-announce/2015-April/156727.html | Third Party Advisory |
| http://lists.qt-project.org/pipermail/announce/2015-April/000067.html | Patch Vendor Advisory |
| http://www.securityfocus.com/bid/74307 | Third Party Advisory VDB Entry |
| http://www.securityfocus.com/bid/74310 | |
| http://www.ubuntu.com/usn/USN-2626-1 | |
| https://security.gentoo.org/glsa/201603-10 |