CVE-2026-20316
Exploitation confirmed. First attested on 2026-07-29 by CISA-ADP, CISA KEV, GCVE · enisa-cnw-kev, GCVE · kevintel.
- Published2026-07-29
- WeaknessCWE-259
Am I affected?
Debian, Ubuntu or Red Hat sometimes backport a fix without changing the upstream version number: such a version reads « to verify », never « affected ».With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.
Description
A vulnerability in the web interface of Cisco Secure Firewall Management Center (FMC) Software could allow an unauthenticated, remote attacker to log in to an affected device using a low-privileged account to access sensitive data within the impacted systems. This vulnerability is due to the presence of static user credentials for a low-privileged account. An attacker could exploit this vulnerability by using the account to log in to an affected system. A successful exploit could allow the attacker to log in to the affected system and access sensitive data as the low-privileged user. Note: If the FMC management interface does not have public internet access, the attack surface that is associated with this vulnerability is reduced. Cisco has assigned this security advisory a Security Impact Rating (SIR) of High rather than Medium as the score indicates. The reason is that this vulnerability can be used with other Cisco Secure FMC Software vulnerabilities to elevate privileges.
Timeline
dates in UTCObserved activity
isMalicious corpus · updated 2026-10-28 09:37 UTCBlock these indicators
- Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2026-20316?format=txt
- CSV export: https://api.ismalicious.com/edl/cve/CVE-2026-20316?format=csv
- TAXII collection of exploited CVEs
- The EDL and CSV take an API key on the Pro plan.
Versions per branch
NVD| Branch | Affected | Fixed in | Source |
|---|---|---|---|
| 7.0 | ≥ 7.0.0, ≤ 7.0.9 | no fix published | NVD |
| 7.2 | ≥ 7.2.0, ≤ 7.2.11 | no fix published | NVD |
| 7.3 | ≥ 7.3.0, ≤ 7.3.1.2 | no fix published | NVD |
| 7.4 | ≥ 7.4.0, ≤ 7.4.7 | no fix published | NVD |
| 7.6 | ≥ 7.6.0, ≤ 7.6.5 | no fix published | NVD |
| 7.7 | ≥ 7.7.0, ≤ 7.7.12 | no fix published | NVD |
| 10.0 | ≥ 10.0.0, ≤ 10.0.1 | no fix published | NVD |
as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.
Fix
- CISA’s required action: Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.due 2026-08-01
Advisories and patches
- sec.cloudapps.cisco.comVendor Advisory
Detection
- Nuclei template
- none so far ProjectDiscovery
- Exploit-DB
- no entry Exploit-DB
- Proof-of-concept repositories
- none listed PoC-in-GitHub
CISA Known Exploited Vulnerability
- Date Added
- 2026-07-29
- Patch Due Date
- 2026-08-01
- Ransomware Use
- Unknown
- Required Action
- Apply mitigations in accordance with vendor instructions, ensuring compliance with CISA’s BOD 26-04 Prioritizing Security Updates Based on Risk (see URL in Notes) guidance and CISA’s “Forensics Triage Requirements” (see URL in Notes). Follow applicable BOD 26-04 guidance for cloud services or discontinue use of the product if mitigations are unavailable. Stakeholders are responsible for evaluating each asset's internet exposure and ensuring adherence to BOD 26-04 patching guidelines.
Sources
Technical details
- CVSS v3 Vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
- Published
- 2026-07-29
- Last Modified
- 2026-10-24
- NVD status
- Analyzed
Frequently asked questions
What is CVE-2026-20316?
Is CVE-2026-20316 actively exploited?
What is the CVSS score for CVE-2026-20316?
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Surveillance reads the versions in your stack — a domain, a lockfile or a list — checks each CVE against the ranges its sources publish, and alerts you when one you run is exploited or enters CISA KEV. A version it cannot read stays « version not verified ».
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Related vulnerabilities
Same product first, then the same vendor advisory and the same publication week.