Threats / Palo Alto Networks / CVE-2026-0257
CVE-2026-0257
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-08-04
Palo Alto Networks PAN-OS vulnerability
Palo Alto Networks PAN-OS contains an authentication bypass vulnerability allowing attackers to establish unauthorized VPN connections and bypass security restrictions.
Verdict
Today item, not a backlog item.
An authentication bypass in PAN-OS enables unauthenticated threat actors to circumvent access controls and establish VPN sessions without valid credentials. Active exploitation in the wild increases operational risk for affected organizations.
CISA KEV Yes · 2026-05-295Ransomware use Flagged5EPSS 0.93905 (verify live)6Exploit Weaponized · public PoC7CVSS 7.83CISA SSVC Exploitation: active · Automatable: no · Impact: total4
01
Is it exploitable?
— the evidence, ranked above the scoreExploit available
Fully weaponized — public exploit code is cataloged for this vulnerability.We link the existence of the exploit; we do not host or redistribute payloads.
Reported exploitation
12 independent public reports of in-the-wild exploitation are cataloged.Distinct reporting sources (vendor, incident response, government); open them for the underlying claims.
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-05-29), flagged for known ransomware use.
Probability (EPSS)
EPSS 0.93905 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 7.8 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:N/SC:H/SI:H/SA:N/E:A/AU:N/R:A/V:D/RE:M/U:Red) · Affected: Palo Alto Networks, PAN-OS. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 4.0, set at disclosure.
Weakness (CWE)
Mapped to CWE-565 Reliance on Cookies — weakness family: Authentication.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: no · Technical Impact: totalCISA's own stakeholder-specific triage inputs, published in the CVE record (CISA Coordinator role). NOTE: this is CISA's three decision points; the final Act/Attend/Track decision also requires a Mission & Well-being input not published here, so no overall decision is asserted.
Currency of the record
CISA added this to its KEV catalog 16 days after the CVE record was published.KEV lag = CISA-KEV dateAdded − CVE.org datePublished; a floor on how long the known-exploited flaw sat in the public record before the federal catalog listed it. Severity/weakness here is CNA- or CISA-assigned (current at disclosure), independent of NVD's analysis backlog.
Public exploit available
Public exploit tooling is catalogued for this CVE (a public proof-of-concept / detection template). Catalog entries: nuclei template. We link the catalog page(s) only — no payload or code is hosted or restated here.Link, never host — the catalog page is the source; basicsecurity.net does not redistribute payloads.
02
Who’s exploiting it?
— attribution turns risk into urgencyAttribution not established
No confirmed (advisory-backed) threat-actor attribution is established for this record. Absence of a named actor is not absence of compromise — see Coverage & confidence.
03
Why it matters
— the attack path, told twice: adversary, then board1
Front door — unauthenticated access narrative 1
Attacker
I craft a malicious request that bypasses the VPN authentication mechanism in PAN-OS.
Business
Unauthorized remote access to the network perimeter is established, creating an entry point for lateral movement and data exfiltration.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I establish a VPN session without providing valid credentials, gaining network access as an authenticated user.
Business
Internal network resources become accessible to external threat actors, elevating exposure to compromise of sensitive systems and data.
3
Lateral reach — past segmentation narrative 3
Attacker
I move laterally within the network to identify and compromise high-value targets.
Business
Critical infrastructure, intellectual property, and customer data face direct risk of theft, manipulation, or destruction.
04
What to do
— defensible action- Remediate per the vendor advisory — confirm the fixed build for your version and verify exposure.1
Say it to the boardA vulnerability with this evidence profile is a defensible budget line, not a backlog ticket — fund the change against the proof above.
05