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CVE-2024-20353

Loop with Unreachable Exit Condition

CVSS 3.1 High 8.6Known exploited (CISA KEV)

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

Description

A vulnerability in the management and VPN web servers for Cisco Adaptive Security Appliance (ASA) Software and Cisco Firepower Threat Defense (FTD) Software could allow an unauthenticated, remote attacker to cause the device to reload unexpectedly, resulting in a denial of service (DoS) condition. This vulnerability is due to incomplete error checking when parsing an HTTP header. An attacker could exploit this vulnerability by sending a crafted HTTP request to a targeted web server on a device. A successful exploit could allow the attacker to cause a DoS condition when the device reloads.

Official description from the CVE record, published by cisco. Copyright © 1999-2026 The MITRE Corporation. See /security/cve/legal for the CVE license. View the record on cve.org

Key data

CVSS 3.1 High 8.6

Score published by cisco in the CVE record.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H

  • Attack vector: Network

    The vulnerable component can be reached over a network, possibly from the Internet.

  • Attack complexity: Low

    No special conditions are needed. The attack can be repeated at will.

  • Privileges required: None

    No account or privileges are needed.

  • User interaction: None

    No action from any user is needed.

  • Scope: Changed

    The impact can reach other components beyond the vulnerable one.

  • Confidentiality impact: None

    No effect on the secrecy of data.

  • Integrity impact: None

    No effect on the trustworthiness of data.

  • Availability impact: High

    Serious or total effect on availability.

CVSS is owned and managed by FIRST.Org, Inc. (FIRST) and is used by permission. Each CVSS score on this site is shown together with its vector string, as published in the CVE record by the source named next to it. Learn more at first.org/cvss.

EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.
Score
0.69824 (69.8% probability)
Percentile
99.4%
Scores of
Nov 10, 2026
Model
v2026.06.15

CISA Known Exploited Vulnerabilities

This CVE is listed in the CISA KEV catalog.
Name in the catalog
Cisco ASA and FTD Denial of Service Vulnerability
Added to the catalog
Apr 24, 2024
Federal due date
May 1, 2024

CISA assessment as of Apr 29, 2024

Stakeholder-Specific Vulnerability Categorization (SSVC) decision points added by CISA.
Exploitation
Recorded by CISA as active
Automatable
yes
Technical impact
partial

Weakness (CWE)

CWE catalog version 5.0.
CWE names: Copyright © 2006-2026, The MITRE Corporation. See /security/cve/legal for the CWE license.
  • CWE-835Loop with Unreachable Exit Condition

Affected products

Products listed in the CVE record, as the CNA published them.

  • Cisco Adaptive Security Appliance (ASA) Software

    • affected: 9.8.1
    • affected: 9.8.1.5
    • affected: 9.8.1.7
    • affected: 9.8.2
    • affected: 9.8.2.8
    • affected: 9.8.2.14
    • affected: 9.8.2.15
    • affected: 9.8.2.17
    • affected: 9.8.2.20
    • affected: 9.8.2.24
    • affected: 9.8.2.26
    • affected: 9.8.2.28
    • affected: 9.8.2.33
    • affected: 9.8.2.35
    • affected: 9.8.2.38
    • affected: 9.8.3.8
    • affected: 9.8.3.11
    • affected: 9.8.3.14
    • affected: 9.8.3.16
    • affected: 9.8.3.18
    • affected: 9.8.3.21
    • affected: 9.8.3
    • affected: 9.8.3.26
    • affected: 9.8.3.29
    • affected: 9.8.4
    • and 162 more

  • Cisco Firepower Threat Defense Software

    • affected: 6.2.3
    • affected: 6.2.3.1
    • affected: 6.2.3.2
    • affected: 6.2.3.3
    • affected: 6.2.3.4
    • affected: 6.2.3.5
    • affected: 6.2.3.6
    • affected: 6.2.3.7
    • affected: 6.2.3.8
    • affected: 6.2.3.10
    • affected: 6.2.3.11
    • affected: 6.2.3.9
    • affected: 6.2.3.12
    • affected: 6.2.3.13
    • affected: 6.2.3.14
    • affected: 6.2.3.15
    • affected: 6.2.3.16
    • affected: 6.2.3.17
    • affected: 6.2.3.18
    • affected: 6.6.0
    • affected: 6.6.0.1
    • affected: 6.6.1
    • affected: 6.6.3
    • affected: 6.6.4
    • affected: 6.6.5
    • and 55 more

References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

Timeline

  1. ID reserved
  2. Added to CISA KEV
  3. Record published
  4. Record last updated

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About CubePath

CubePath is a cloud provider with data centers in Europe and the United States. It offers VPS, bare metal servers and DDoS protection.
Cloud VPSDDoS protection

Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 19:23 UTC. Sources and licenses