Threats / Microsoft / CVE-2017-0210
CVE-2017-0210
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Microsoft Internet Explorer vulnerability
Internet Explorer privilege escalation via improper cross-domain policy enforcement allows attackers to access sensitive information.
Verdict
Today item — known-exploited.
A privilege escalation flaw in Internet Explorer's cross-domain policy enforcement enables unauthorized information disclosure. Active exploitation in the wild demonstrates practical threat; moderate EPSS score reflects real-world attack feasibility.
CISA KEV Yes · 2022-05-244EPSS 0.19522 (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
3 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 2022-05-24).
Probability (EPSS)
EPSS 0.19522 — 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.
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 1868 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 that exploits Internet Explorer's cross-domain policy bypass to escalate my privileges.
Business
User browsers become vectors for unauthorized data access, compromising confidentiality of sensitive information.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I leverage the privilege escalation to access restricted resources or information normally protected by domain boundaries.
Business
Attackers gain unauthorized visibility into user data across security domains, eroding trust in browser isolation mechanisms.
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