October 13, 2026

CVE Watchtower

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CVE-2020-3259NVD

Vulnerability Summary

A vulnerability in the web services interface of Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to retrieve memory contents on an affected device, which could lead to the disclosure of confidential information. The vulnerability is due to a buffer tracking issue when the software parses invalid URLs that are requested from the web services interface. An attacker could exploit this vulnerability by sending a crafted GET request to the web services interface. A successful exploit could allow the attacker to retrieve memory contents, which could lead to the disclosure of confidential information. Note: This vulnerability affects only specific AnyConnect and WebVPN configurations. For more information, see the Vulnerable Products section.
Severity Level
HIGH(7.5)
Published Date
May 6, 2020
Last Modified
Aug 12, 2026
Exploitation Status
ACTIVE
EPSS Score (30-Day)
71.79%Probability
Root Weakness (CWE)
CWE-200: Unknown/Unlisted Weakness ↗
Refer to the official MITRE database for detailed architectural specifications regarding this weakness.
CVSS v3.1 Base Metrics — Score 7.5 (HIGH)
Attack VectorNetwork
Attack ComplexityLow
Privileges RequiredNone
User InteractionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityNone
AvailabilityNone

Affected & Patched Versions

Affected Versions
  • Cisco Secure Firewall Threat Defense >= 6.2.3 and < 6.2.3.16
  • Cisco Secure Firewall Threat Defense >= 6.3.0 and < 6.3.0.6
  • Cisco Secure Firewall Threat Defense >= 6.4.0 and < 6.4.0.9
  • Cisco Secure Firewall Threat Defense >= 6.5.0 and < 6.5.0.5
  • Cisco Adaptive Security Appliance Software >= 9.8 and < 9.8.4.20
  • Cisco Adaptive Security Appliance Software >= 9.9 and < 9.9.2.67
  • Cisco Adaptive Security Appliance Software >= 9.10 and < 9.10.1.40
  • Cisco Adaptive Security Appliance Software >= 9.12 and < 9.12.3.9
  • Cisco Adaptive Security Appliance Software >= 9.13 and < 9.13.1.10
Patched Versions
  • Cisco Secure Firewall Threat Defense 6.2.3.16
  • Cisco Secure Firewall Threat Defense 6.3.0.6
  • Cisco Secure Firewall Threat Defense 6.4.0.9
  • Cisco Secure Firewall Threat Defense 6.5.0.5
  • Cisco Adaptive Security Appliance Software 9.8.4.20
  • Cisco Adaptive Security Appliance Software 9.9.2.67
  • Cisco Adaptive Security Appliance Software 9.10.1.40
  • Cisco Adaptive Security Appliance Software 9.12.3.9
  • Cisco Adaptive Security Appliance Software 9.13.1.10
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💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.
🎁7-Day Free Trial — Try Pro or Team, no card required.
📧Email Delivery — Threat intel straight to your inbox.
♾️Unlimited Vendors — Track your entire stack.
🚨All New CVEs — Be the first to know.
📈EPSS Spike Alerts — Catch rising risk before it peaks.
🎯Custom EPSS/CVSS — Filter noise, focus on risk.
🛡️Exploit Intel — A 2nd confirmed-exploit signal beyond KEV.
🐙GitHub Issues — Auto-tracked, no duplicates.
📬Weekly Digest — One clean summary, not inbox spam.
🏷️Watchlist Groups — Tag alerts by team (Infra/AppSec/SOC).
💬Webhooks — Slack & Teams integration.
🔀Smart Routing — Critical alerts to one channel, rest to another.
🚫Ad-Free — Uninterrupted experience.

External References