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vulnerability

CVE-2025-31277

8.8
High
KEV · Exploited in wildEPSS 2%Patch available

The issue was addressed with improved memory handling. This issue is fixed in Safari 18.6, iOS 18.6 and iPadOS 18.6, macOS Sequoia 15.6, tvOS 18.6, visionOS 2.6, watchOS 11.6. Processing maliciously crafted web content may lead to memory corruption.

exploited
Yes, in CISA KEV since 20 Mar 2026fix by 3 Apr 2026 (CISA deadline for US federal agencies)unvetted proof-of-concept code on github
fix
Patch available see the advisory in the references
likelihood
EPSS 1.7%
Published 30 Jul 2025Analysed here 2 Nov 2026CVSS scored by CISA

do firstApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

triage
server-sideruntimeWAF can block: noAV · networkCWE-119· Buffer Boundary ErrorCWE-120· Buffer Overflow

Can a WAF block it? No. The vulnerability occurs when processing maliciously crafted web content, which is delivered via HTTP requests to the browser. The malicious content looks like normal web content, so a web application firewall cannot reliably distinguish and block it without affecting legitimate users.

Also consider: patch

Based on an AI reading of the CVE description, and no vendor rule found yet. We check Cloudflare, AWS, Google Cloud Armor and Azure; for Akamai, Imperva, Fastly, F5, ask your vendor.

cvss vector
attack vectornetworkattack complexitylowprivileges requirednoneuser interactionrequiredscopeunchangedconfidentialityhighintegrityhighavailabilityhigh
CVSS 3.1 · CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
common questions

Is CVE-2025-31277 being exploited?

Yes. CVE-2025-31277 appears in CISA's Known Exploited Vulnerabilities catalog, which means exploitation in the wild has been confirmed and reported. Treat it as active rather than theoretical, and patch it ahead of higher-scoring vulnerabilities that carry no exploitation evidence.

How severe is CVE-2025-31277?

CVE-2025-31277 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.

Is there a patch for CVE-2025-31277?

Yes. A fix has been recorded for CVE-2025-31277. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.

What does CVE-2025-31277 affect?

CVE-2025-31277 affects apple:safari, apple:ipados, apple:iphone_os, apple:macos, and 11 further products or versions. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.

Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.

executive summary
technical analysis
affected
apple:safariapple:ipadosapple:iphone_osapple:macosapple:tvosapple:visionosapple:watchoswebkitgtk:webkitgtkwpewebkit:wpe_webkitredhat:enterprise_linuxredhat:enterprise_linux_ausredhat:enterprise_linux_elsredhat:enterprise_linux_eusredhat:enterprise_linux_tusredhat:enterprise_linux_update_services_for_sap_solutions
affected versions
Apple iOS and iPadOS
  • affected< 18.6
Apple macOS
  • affected< 15.6
Apple Safari
  • affected< 18.6
Apple tvOS
  • affected< 18.6
Apple visionOS
  • affected< 2.6
Apple watchOS
  • affected< 11.6

As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.

public exploits

Unvetted proof-of-concept code on GitHub: 2 GitHub proofs of concept

Listed so you can judge urgency, not as a recommendation to run anything. GitHub “proofs of concept” are unvetted: some are fake or carry malware. Exploit-DB marks the entries its staff verified.

cisa ssvc

exploitation
active
automatable
no
technical impact
total

Assessed by CISA 21 Mar 2026 (SSVC 2.0.3).

timeline

  1. 30 Jul 2025Published
  2. 20 Mar 2026Added to CISA KEV (exploited in the wild) · 233 days (about 8 months) later
  3. 21 Mar 2026CISA SSVC assessment: exploitation active · 1 day later
  4. 27 Mar 2026First proof-of-concept repository on GitHub (unvetted) · 6 days later
  5. 3 Apr 2026CISA remediation due date (US federal agencies) · 7 days later
  6. 21 Sept 2026CVE record last updated · 172 days (about 6 months) later
  7. 2 Nov 2026Analysed by vulneraibility.com · 42 days later
how to fix
Remediation steps are tailored for users whose stack is affected. Add this technology to your stack to see the fix checklist.
references
NVDCVE.orgCVE DetailsSource
25 references in the CVE record: 11 advisories, 14 links
Show 17 more

sources

  • CVE List (CVE.org): description, affected versions, references; CVE Terms of Use
  • NVD: CVSS and CPE data
  • CISA KEV catalog: exploitation, date added, due date
  • CISA Vulnrichment (ADP): SSVC decision points
  • FIRST EPSS: exploit probability and percentile
  • PoC-in-GitHub: GitHub repositories that claim a proof of concept
  • Summary, impact and triage tags: written by our AI analysis pipeline from the sources above. Check them against the sources.
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