Threats / Microsoft / CVE-2015-2419
CVE-2015-2419
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Microsoft Internet Explorer vulnerability
A memory corruption vulnerability in JScript within Microsoft Internet Explorer allows remote code execution or denial of service when users visit a crafted website.
Verdict
Today item — known-exploited.
Remote attackers can exploit this vulnerability by hosting malicious web content. Successful exploitation results in arbitrary code execution with user privileges or application crash, affecting confidentiality, integrity, and availability.
CISA KEV Yes · 2022-03-284EPSS 0.44688 (verify live)5CVSS 8.8 (CISA)3CISA SSVC Exploitation: active · Automatable: no · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
10 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-03-28).
Probability (EPSS)
EPSS 0.44688 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 8.8 (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H) · Affected: Microsoft, Internet Explorer. Confirm exact fixed builds in the vendor advisory.CVSS — CISA-assigned via the ADP container (CVE.org), version 3.1; the CNA left no metrics, so CISA's own score is used ahead of NVD.
Weakness (CWE)
Mapped to CWE-119 Memory Buffer Bounds Error — weakness family: Memory safety.CWE assignment from the public NVD record (may be stale); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 2449 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious webpage containing specially formatted content that triggers a memory corruption flaw in the JScript engine.
Business
The organization faces risk of employee systems being compromised when users browse untrusted or compromised websites.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I host this webpage on a server or inject it into legitimate sites through compromise or advertising networks.
Business
Attack surface expands across web browsing activities, making prevention difficult without comprehensive endpoint controls.
3
Lateral reach — past segmentation narrative 3
Attacker
I deliver the exploit to targets via email links, watering hole attacks, or drive-by downloads when they visit the malicious page.
Business
User systems execute arbitrary code under the victim's account context, enabling data theft, lateral movement, or malware installation.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05