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Apexward Pulse
Type Vulnerability

Cisco · Memory corruption

Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability

1 sourceCVE-2025-20333CVE-2025-20362

At a glance

Medium
7-day window, from the last update
ActiveConfirmed in-the-wild exploitation
Evidence-weighted, not popularity
Signal

Actively exploited in the wild — prioritise confirming exposure.

Why Medium

Medium rather than High: exposure is scored at a default because we cannot see your systems or suppliers. If you run or depend on Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense, treat it as High.

Briefing

There is no written leader briefing for this story yet. These questions come from the facts we hold.

Questions to ask IT

  • Do we run Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense, and which versions?
  • Is any of it reachable from the internet?
  • Have we checked whether it has already been used against us?
  • If it is not yet patched, what mitigation is in place, and will the fix be done by 11 Nov?

Next steps

  1. Confirm exposure, mitigation status and any service interruption risk.

Summary

  • Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a missing authorisation vulnerability. This vulnerability could be chained with CVE-2025-20333. Affects Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense. Known ransomware campaign use:
  • CVE-2025-20333 is listed in known-exploited catalogue (exploitation in the wild)
  • CVE-2025-20362 has estimated attack likelihood 0.85543 (~85.5% estimated chance of exploitation in 30 days; 99.7th percentile) as of 2026-07-31 — probability signal, not confirmed exploitation
  • Authoritative catalogues report active exploitation of this vulnerability.

Why this matters in the UK

  • Known-exploited catalogue reports exploitation in the wild

Products and services involved

5 reports

Part of Multiple buffer and memory overflow vulnerabilities

Pulse

Last checked 54m ago · Next recheck 10 Nov 2026, 04:06 UK time

Update
4 Nov 2026, 23:34 UK time · 4d ago

Suggested changed to 7d.

Listed on the — prioritise confirming exposure and patching.

EscalationDe-escalationCritical / liveWhat these mean
Drag to pan · Ctrl / ⌘ + scroll or pinch to zoom12 events

1 quiet check hidden.

Sources

How we know

Statements extracted from sources. Higher confidence means stronger corroboration.

  • ConfirmedHeadline90% confidence

    Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Buffer Overflow Vulnerability

  • ConfirmedSummary fact75% confidence

    Cisco Secure Firewall Adaptive Security (ASA) Appliance and Secure Firewall Threat Defense (FTD) Software VPN Web Server contain a buffer overflow vulnerability that allows for remote code execution. This vulnerability could be chained with CVE-2025-20362. Affects Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense. Known ransomware campaign use: Unknown.

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2025-20333

  • ConfirmedKnown-exploited catalogue98% confidence

    CVE-2025-20333 is listed in known-exploited catalogue (exploitation in the wild)

  • ConfirmedCVE identifier95% confidence

    Event involves CVE-2025-20362

  • ConfirmedKnown-exploited catalogue98% confidence

    CVE-2025-20362 is listed in known-exploited catalogue (exploitation in the wild)

  • ConfirmedEstimated attack likelihood95% confidence

    CVE-2025-20362 has estimated attack likelihood 0.85543 (~85.5% estimated chance of exploitation in 30 days; 99.7th percentile) as of 2026-07-31 — probability signal, not confirmed exploitation