CVE Intelligence
Medium Injection

CVE-2026-20008 — Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Lua Code Injection Vulnerability

A vulnerability in a small subset of CLI commands that are used on Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, local attacker to craft Lua code that could be used on the underlying operating system as root. This vulnerability exists because user-provided input is not properly sanitized. An attacker could exploit this vulnerability by crafting valid Lua code and submitting it as a malicious parameter for a CLI command. A successful exploit could allow the attacker to inject Lua code, which could lead to arbitrary code execution as the root user. To exploit this vulnerability, an attacker must have valid Administrator credentials.

Published Mar 4, 2026 · Updated Oct 13, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: cisco

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.
How the score was calculated
  • EPSS 0.1% (30-day exploitation probability)+0
  • Technical severity (medium)+3

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation
Not confirmed
Not in CISA KEV — an absence of record, not proof it is unexploited.
EPSS FIRST
0.14%
ahead of 3% of scored CVEs · Oct 14, 2026
Affects
Cisco
Adaptive Security Appliance Software and 3 more
CVSS base
6.0
Medium · 2 source(s)

CISA SSVC assessment CISA

Three decision points CISA publishes for the CVEs it assesses (SSVC 2.0.3). A stakeholder decision, not a severity score.

Exploitation
None
none · proof-of-concept · active
Automatable
No
can an attacker script the kill-chain steps
Technical impact
Total
partial · total control of the vulnerable component

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

  1. Identify exposed assets running the affected vendor/product/version combinations (Cisco Adaptive Security Appliance Software, Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software, Cisco Cisco Secure Firewall Threat Defense (FTD) Software…).
  2. No fix documented in the sources: reduce exposure and monitor the vendor advisory.
  3. Search available logs for exploit probes matching the vulnerability class (injection), errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

VendorProductVersionsStatusSource
Cisco Adaptive Security Appliance Software ≥ 9.12.1 and < 9.16.4.85≥ 9.17.1 and < 9.18.4.66≥ 9.19.1 and < 9.20.4≥ 9.22.1.1 and < 9.22.2.4≥ 9.23.1 and < 9.23.1.7 Vulnerable NIST National Vulnerability Database
Cisco Cisco Secure Firewall Adaptive Security Appliance (ASA) Software version 9.16.4.62version 9.18.4.34version 9.20.3version 9.16.4.67version 9.16.4.70version 9.18.4.40version 9.23.1version 9.22.1.1
and 139 more version 9.16.4.71version 9.20.3.4version 9.18.4.47version 9.20.3.7version 9.17.1.45version 9.19.1.37version 9.17.1.46version 9.16.4.76version 9.20.3.9version 9.19.1.38version 9.18.4.50version 9.22.1.3version 9.20.3.10version 9.22.1.2version 9.18.4.52version 9.20.3.13version 9.22.1.6version 9.18.4.53version 9.16.4.82version 9.22.2version 9.20.3.16version 9.19.1.42version 9.18.4.57version 9.16.4.84version 9.23.1.3version 9.20.3.20version 9.12.3version 9.12.1version 9.12.2version 9.12.4version 9.12.3.2version 9.12.3.7version 9.12.2.5version 9.12.3.12version 9.12.1.3version 9.12.2.4version 9.12.1.2version 9.12.2.9version 9.12.3.9version 9.12.2.1version 9.12.4.2version 9.12.4.4version 9.12.4.7version 9.12.4.8version 9.12.4.10version 9.12.4.13version 9.12.4.18version 9.12.4.24version 9.16.1version 9.12.4.26version 9.16.1.28version 9.12.4.29version 9.16.2version 9.12.4.30version 9.16.2.3version 9.12.4.35version 9.16.2.7version 9.12.4.37version 9.17.1version 9.16.2.11version 9.16.2.13version 9.12.4.39version 9.12.4.38version 9.16.2.14version 9.17.1.7version 9.12.4.40version 9.16.3.3version 9.16.3version 9.16.3.14version 9.17.1.9version 9.12.4.41version 9.17.1.10version 9.18.1version 9.12.4.47version 9.16.3.15version 9.18.1.3version 9.17.1.11version 9.12.4.48version 9.18.2version 9.16.3.19version 9.17.1.13version 9.12.4.50version 9.17.1.15version 9.12.4.52version 9.16.3.23version 9.18.2.5version 9.16.4version 9.12.4.54version 9.17.1.20version 9.18.2.7version 9.19.1version 9.16.4.9version 9.12.4.55version 9.18.2.8version 9.16.4.14version 9.18.3version 9.19.1.5version 9.12.4.56version 9.17.1.30version 9.19.1.9version 9.18.3.39version 9.16.4.19version 9.12.4.58version 9.19.1.12version 9.18.3.46version 9.16.4.27version 9.19.1.18version 9.18.3.53version 9.18.3.55version 9.16.4.38version 9.17.1.33version 9.12.4.62version 9.16.4.39version 9.18.3.56version 9.20.1version 9.16.4.42version 9.19.1.22version 9.18.4version 9.20.1.5version 9.18.4.5version 9.19.1.24version 9.16.4.48version 9.18.4.8version 9.20.2version 9.19.1.27version 9.12.4.65version 9.16.4.55version 9.18.4.22version 9.20.2.10version 9.16.4.57version 9.19.1.28version 9.17.1.39version 9.12.4.67version 9.18.4.24version 9.20.2.21version 9.16.4.61version 9.19.1.31version 9.18.4.29version 9.20.2.22
Vulnerable CVE Program (cve.org) e CISA ADP
Cisco Cisco Secure Firewall Threat Defense (FTD) Software version 6.4.0.1version 6.4.0.2version 6.4.0.5version 6.4.0version 6.4.0.3version 6.4.0.4version 6.4.0.6version 6.4.0.7
and 67 more version 6.4.0.8version 6.4.0.9version 6.4.0.10version 6.4.0.11version 6.4.0.12version 7.0.0version 7.0.0.1version 7.0.1version 7.1.0version 6.4.0.13version 7.0.1.1version 6.4.0.14version 7.1.0.1version 7.0.2version 6.4.0.15version 7.2.0version 7.0.2.1version 7.0.3version 7.1.0.2version 7.2.0.1version 7.0.4version 7.2.1version 7.0.5version 6.4.0.16version 7.3.0version 7.2.2version 7.2.3version 7.3.1version 7.1.0.3version 7.2.4version 7.0.6version 7.2.5version 7.2.4.1version 7.3.1.1version 7.4.0version 6.4.0.17version 7.0.6.1version 7.2.5.1version 7.4.1version 7.2.6version 7.0.6.2version 7.4.1.1version 6.4.0.18version 7.2.7version 7.2.5.2version 7.3.1.2version 7.2.8version 7.6.0version 7.4.2version 7.2.8.1version 7.0.6.3version 7.4.2.1version 7.2.9version 7.0.7version 7.7.0version 7.4.2.2version 7.2.10version 7.6.1version 7.4.2.3version 7.0.8version 7.6.2version 7.7.10version 7.0.8.1version 7.6.2.1version 7.7.10.1version 7.4.2.4version 7.2.10.2
Vulnerable CVE Program (cve.org) e CISA ADP
Cisco Secure Firewall Threat Defense ≥ 6.4.0 and < 7.0.9≥ 7.1.0 and < 7.2.11≥ 7.3.0 and < 7.4.3≥ 7.6.0 and < 7.6.4≥ 7.7.0 and < 7.7.11 Vulnerable NIST National Vulnerability Database

Attack characteristics

The CVSS vector, decoded. It describes the attack, not your exposure to it.

Attack vector
Local
Attack complexity
Low
Privileges required
High
User interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

Every base score collected

Sources score independently and may disagree; each row says who scored it and under which version.

ScoreVersionSeverityExpl.ImpactScored by
6.0 CVSS 3.1 Medium 0.8 5.2 psirt@cisco.com via NIST National Vulnerability Database
6.0 CVSS 3.1 Medium — — cisco via CVE Program (cve.org) e CISA ADP
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N (score shown at the top: psirt@cisco.com)

Weakness MITRE

Weakness class according to MITRE’s CWE catalog.

CWE-78 · OS Command Injection

Other CVEs with this weakness →

EPSS over time FIRST

Oct 13, 2026 → Oct 14, 2026 · 2 reading(s) · max 0.14%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

  • Local/physical vector: focus on endpoint telemetry (EDR) from affected hosts.
  • Look for parameters with command/query metacharacters and unexpected child processes of the service.
endpoint telemetry (EDR)application logs

Timeline

What happened to this CVE, newest first.

  • 2026
  • Affected products added · cisco/cisco secure firewall adaptive security appliance (asa) software, cisco/cisco secure firewall threat defense (ftd)
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • SSVC assessment updated
    Oct 13, 2026 · CVE Program (cve.org) e CISA ADP
  • Record published
    Oct 13, 2026
  • CVSS changed · 6.0
    Oct 13, 2026 · NIST National Vulnerability Database
  • Source status changed · → Analyzed
    Oct 13, 2026 · NIST National Vulnerability Database
  • Record created in this database
    Oct 13, 2026 · NIST National Vulnerability Database
  • CVE published
    Mar 4, 2026 · cisco

Source activity

Repeated readings are counted rather than listed.

  • 1× Official description updated · Oct 13, 2026 – Oct 13, 2026

References

1 on the record

Elsewhere on this site

Cisco
every CVE for this vendor
Injection
same class
CWE-78
other pages naming this weakness

Related CVEs (same products)

  • CVE-2026-20349 Cisco Secure Firewall Adaptive Security Appliance (ASA) and Secure Firewall Threat Defense (FTD) Heap Inspection Vulnerability KEV Aug 11, 2026
  • CVE-2026-20012 Missing Release of Memory after Effective Lifetime in Cisco Secure Firewall Threat Defense Mar 25, 2026
  • CVE-2026-20064 NULL Pointer Dereference in Cisco Secure Firewall Threat Defense Mar 4, 2026
  • CVE-2026-20024 Buffer Errors (Improper Restriction of Operations within Memory Bounds) in Cisco Adaptive Security Appliance Software Mar 4, 2026
  • CVE-2026-20025 Integer Overflow or Wraparound in Cisco Secure Firewall Threat Defense Mar 4, 2026
  • CVE-2026-20023 Out-of-bounds Write in Cisco Secure Firewall Threat Defense Mar 4, 2026

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

  • No fixed version, patch or mitigation documented.
  • No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
  • No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
  • No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-20008 is "Cisco Secure Firewall Adaptive Security Appliance and Secure Firewall Threat Defense Software Lua Code Injection Vulnerability", rated Medium. It affects Adaptive Security Appliance Software (Cisco); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. CVSS 6.0 describes technical severity. EPSS 0.14% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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