Use-after-free vulnerability in the nsEditor::IsPreformatted function in editor/libeditor/base/nsEditor.cpp in Mozilla Firefox before 19.0.2, Firefox ESR 17.x before 17.0.4, Thunderbird before 17.0.4, Thunderbird ESR 17.x before 17.0.4, and SeaMonkey before 2.16.1 allows remote attackers to execute arbitrary code via vectors involving an execCommand call.
Conclusion & alert: CVE-2013-0787 is rated High Risk (67.8/100): CVSS Critical severity, with high exploitation likelihood (EPSS 6.40%, 93th 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 | 8.28% | 6.40% | -1.88% |
| 2 | 2026-05-24 | 4.56% | 8.28% | +3.72% |
| 3 | 2026-03-14 | — | 4.56% | — |
Full EPSS history (15 records total)
CVSS metrics for this CVE.
| Base score | Version | Severity | Vector | Exploitability | Impact | Score source |
|---|---|---|---|---|---|---|
| 9.3 | 2.0 | HIGH |
|
8.6 | 10.0 | [email protected] |
| vendor | priority | summary | link |
|---|---|---|---|
gentoo
|
high | CVE-2013-0787: 1 GLSA(s) (201309-23), 6 atom(s) (mail-client/thunderbird, mail-client/thunderbird-bin, www-client/firefox, www-client/firefox-bin, www-client/seamonkey, www-client/seamonkey-bin); latest impact high. | https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2013-0787 |
redhat
|
critical | — | https://access.redhat.com/security/cve/CVE-2013-0787 |
suse
|
critical | CVE-2013-0787 severity critical: SUSE including 87 source package names (MozillaFirefox, MozillaFirefox-140.2.0-160000.1.2, …), 146 product×package rows across 40 product lines (SUSE Enterprise Storage 7.1, SUSE Linux Enterprise Desktop 11 SP2, … (40 product lines)): Fixed 124, Known Not Affected 22. | https://www.suse.com/security/cve/CVE-2013-0787/ |
ubuntu
|
medium | CVE-2013-0787 medium priority: Ubuntu including 5 source packages (firefox, seamonkey, thunderbird, xulrunner-1.9.2, xulrunner-2.0), 40 status rows across 8 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, upstream): DNE 16, released 15, ignored 7, needs-triage 2. | https://ubuntu.com/security/CVE-2013-0787 |
| Vendor | Product | Version | Raw CPE |
|---|---|---|---|
| mozilla | firefox | <= 19.0.1 | cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* |
| mozilla | firefox | 19.0 | cpe:2.3:a:mozilla:firefox:19.0:*:*:*:*:*:*:* |
| mozilla | firefox | 17.0 | cpe:2.3:a:mozilla:firefox:17.0:*:*:*:*:*:*:* |
| mozilla | firefox | 17.0.1 | cpe:2.3:a:mozilla:firefox:17.0.1:*:*:*:*:*:*:* |
| mozilla | firefox | 17.0.2 | cpe:2.3:a:mozilla:firefox:17.0.2:*:*:*:*:*:*:* |
| mozilla | firefox | 17.0.3 | cpe:2.3:a:mozilla:firefox:17.0.3:*:*:*:*:*:*:* |
| mozilla | thunderbird | <= 17.0.3 | cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* |
| mozilla | thunderbird | 17.0 | cpe:2.3:a:mozilla:thunderbird:17.0:*:*:*:*:*:*:* |
| mozilla | thunderbird | 17.0.1 | cpe:2.3:a:mozilla:thunderbird:17.0.1:*:*:*:*:*:*:* |
| mozilla | thunderbird | 17.0.2 | cpe:2.3:a:mozilla:thunderbird:17.0.2:*:*:*:*:*:*:* |
| mozilla | thunderbird_esr | 17.0 | cpe:2.3:a:mozilla:thunderbird_esr:17.0:*:*:*:*:*:*:* |
| mozilla | thunderbird_esr | 17.0.1 | cpe:2.3:a:mozilla:thunderbird_esr:17.0.1:*:*:*:*:*:*:* |
| mozilla | thunderbird_esr | 17.0.2 | cpe:2.3:a:mozilla:thunderbird_esr:17.0.2:*:*:*:*:*:*:* |
| mozilla | thunderbird_esr | 17.0.3 | cpe:2.3:a:mozilla:thunderbird_esr:17.0.3:*:*:*:*:*:*:* |
| mozilla | seamonkey | <= 2.16 | cpe:2.3:a:mozilla:seamonkey:*:*:*:*:*:*:*:* |
| mozilla | seamonkey | 2.16 | cpe:2.3:a:mozilla:seamonkey:2.16:beta1:*:*:*:*:*:* |
| mozilla | seamonkey | 2.16 | cpe:2.3:a:mozilla:seamonkey:2.16:beta2:*:*:*:*:*:* |
| mozilla | seamonkey | 2.16 | cpe:2.3:a:mozilla:seamonkey:2.16:beta3:*:*:*:*:*:* |
| mozilla | seamonkey | 2.16 | cpe:2.3:a:mozilla:seamonkey:2.16:beta4:*:*:*:*:*:* |
| mozilla | seamonkey | 2.16 | cpe:2.3:a:mozilla:seamonkey:2.16:beta5:*:*:*:*:*:* |