CVE-2025-20333
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A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense…
rank 86 = 40 + 25 + 5 + 8 + 8
rank@v1 · act now
Someone is already using it
CISA KEV catalog · public proof-of-concept · FIRST EPSS
EPSS 0.70651 · CISA KEV listed · without this subject the record ranks 46
What it costs you if it fires
NVD CVSS base score, then the CNA's own
CVSS 9.9, from the CNA · without this subject the record ranks 61
It is getting worse, not staying still
FIRST EPSS series, rescorings and bad loads removed
rose on 2026-08-28 · without this subject the record ranks 81
How much of the world it touches
NVD CPE configurations
12 products in the CPE ranges · without this subject the record ranks 78
Someone else already set the date
CISA KEV remediation due date
CISA remediation date held · without this subject the record ranks 78
$3.53M = $4.99M incident cost x 1 exposure x 0.70651 likelihood
udv@v1 · unaudited · wrong for you until you say what you run
$4.99M is the cost of a breach that happened, from IBM Cost of a Data Breach Report 2026, global average. It is not the value of any asset of yours. That average already covers breaches of every severity, so scaling it by exposure understates a partial-impact record. That is an assumption, not a measurement. Your own asset value goes in the decision record.
Hindsight · the state
Foresight · where to check next
This record is one instance of CWE-120, buffer copy without checking size of input ('classic buffer overflow'). The index holds 4489 prior instances of this class, 23 KEV-listed. The nearest of its KEV-listed records are drawn beside this. taxonomy@v1
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Harm, if it fires from the vector and the weakness
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CISA KEV & Federal Remediation Deadline from the record and CISA
The fix, and how long it's been waiting.
Show full CISA required action
The KEV due date refers to the deadline by which FCEB agencies are expected to review and begin implementing the guidance outlined in Emergency Directive (ED) 25-03 (URL listed below in Notes). Agencies must follow the mitigation steps provided by CISA (URL listed below in Notes) and vendor’s instructions (URL listed below in Notes). Adhere to the applicable BOD 22-01 guidance for cloud services or discontinue use of the product if mitigations are not available.
Exploit Status & Known PoCs a ladder, not a score
Current rung: Exploited in the wild · CISA KEV listed, 2025-09-25.
Affected & Fixed Versions as published
Show all 12 published ranges
A rung lights from a row in the index, never from an assessment. "Held sources" is the true scope of the claim: this index reads the CVE record, NVD, CISA KEV, FIRST's EPSS and public proof-of-concept repositories, and it does not observe attacks.
Attack path
What it is stated by the CNA
A vulnerability in the VPN web server of Cisco Secure Firewall Adaptive Security Appliance (ASA) Software and Cisco Secure Firewall Threat Defense (FTD) Software could allow an authenticated, remote attacker to execute arbitrary code on an affected device. This vulnerability is due to improper validation of user-supplied input in HTTP(S) requests. An attacker with valid VPN user credentials could exploit this vulnerability by sending crafted HTTP requests to an affected device. A successful exploit could allow the attacker to execute arbitrary code as root, possibly resulting in the complete compromise of the affected device. receipt
NVD's analysis a second authority
- weakness
- CWE-120
- affected versions
- cisco adaptive security appliance software >= 9.12 < 9.12.4.72; cisco adaptive security appliance software >= 9.14 < 9.14.4.28; cisco adaptive security appliance software >= 9.16 < 9.16.4.85; and 9 more, listed in full below
- also scored by
- [email protected] 9.9 CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
check it yourself sec.cloudapps.cisco.com receipt
Dated events
Movement the material steps
This score more than doubled inside 72 hours. Both observations are in the full history below.
Show all 55 observations
55 observations held. A highlighted step crossed a promotion threshold. A step marked with a scoring model moved because the instrument was replaced, not because the vulnerability changed. receipt
The full biography
Listed by CISA on the day it published, exploit probability more than doubled between 2025-10-27 and 2025-10-29 (0.01719 → 0.03527) and the record had been public for 11 months when this index was last written.
The pattern, elsewhere
This record is one instance of CWE-120, buffer copy without checking size of input ('classic buffer overflow'). The index holds 4489 prior instances of this class, 23 KEV-listed. The nearest of its KEV-listed records are drawn beside this. [email protected]
"Matches n of m" counts the attributes the two records can both be compared on: the CVSS metrics they share a version of, any weakness class beyond this one, and the vendor. fit-rules@v1
4489 records in this class held. The six above are drawn from the ones CISA has listed as exploited, ranked by how much of the record matches this one. That is why every one of them is KEV-listed: the pool is, so the colour on those spokes says nothing the pool has not already said.
No curated product neighbourhood is held for this product, so the records above are the nearest this index can name. The neighbourhood table covers a small set of products and is extended by hand.
Siblings and hubs
Records related to this one
Its defect family
cisco secure firewall adaptive security appliance (asa) software
Grouped by shared product and weakness, not by shared vulnerability. Each record's own state is on its own page.
Family membership: held values
Nothing we hold separates this record from the others in its defect family. This page is kept and dated, and the defect family's own page is the one we offer for indexing: the whole group.
Browse the index from here
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What usually comes next
Everything above needs no account. What is below is work: assembling it, scoping it to your estate, watching it, and handing it to someone else.