Threats / Apple / CVE-2025-31277
CVE-2025-31277
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Apple Multiple Products vulnerability
Buffer overflow in Apple's web and OS components allows memory corruption through maliciously crafted web content. Actively exploited in the wild.
Verdict
Today item — known-exploited.
A buffer overflow vulnerability affecting multiple Apple platforms enables attackers to corrupt memory via malicious web content. Active exploitation in the wild indicates immediate risk to users across Safari and related OS components.
CISA KEV Yes · 2026-03-204EPSS 0.01481 (verify live)5CVSS 8.8 (CISA)3CISA SSVC Exploitation: none · Automatable: no · Impact: total3
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
4 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 2026-03-20).
Probability (EPSS)
EPSS 0.01481 — 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: Apple, Multiple Products. 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: none · 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 234 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 malicious web content designed to overflow a buffer in Safari or related rendering engines.
Business
Users face immediate risk of system compromise through routine web browsing without additional user interaction.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I trigger memory corruption by delivering the payload through a website or embedded content that processes the overflow.
Business
Affected Apple devices across iOS, macOS, watchOS, iPadOS, tvOS, and visionOS become vulnerable to code execution.
3
Lateral reach — past segmentation narrative 3
Attacker
I leverage the memory corruption to achieve arbitrary code execution with the privileges of the affected application.
Business
Attackers gain capability to install malware, exfiltrate data, or establish persistent access across Apple's ecosystem.
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