Threats / Palo Alto Networks / CVE-2022-0028
CVE-2022-0028
· EUVD no mirror located
· GCVE no mirror located
Verified 2026-09-19
Palo Alto Networks PAN-OS vulnerability
Palo Alto Networks PAN-OS URL filtering policy misconfiguration enables reflected and amplified TCP denial-of-service attacks from network-based attackers.
Verdict
Today item — known-exploited.
A misconfigured URL filtering policy in PAN-OS allows network attackers to exploit the system as a reflector and amplifier for TCP-based denial-of-service attacks, potentially disrupting service availability for targeted victims.
CISA KEV Yes · 2022-08-225EPSS 0.02383 (verify live)6CVSS 8.63CISA SSVC Exploitation: active · Automatable: yes · Impact: partial4
01
Is it exploitable?
— the evidence, ranked above the scoreReported exploitation
3 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 2022-08-22).
Probability (EPSS)
EPSS 0.02383 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
Severity / affected
CVSS 8.6 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H) · Affected: Palo Alto Networks, PAN-OS. Confirm exact fixed builds in the vendor advisory.CVSS — CNA-assigned (CVE.org), version 3.1, set at disclosure.
Weakness (CWE)
Mapped to CWE-406 CWE-406.CWE — CNA-assigned (CVE.org); the weakness class drives how the flaw is exploited.
CISA SSVC (triage disposition)
Exploitation: active · Automatable: yes · Technical Impact: partialCISA'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 12 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.
WeaknessCWE-406 · CWE-406
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 spoofed requests targeting a misconfigured PAN-OS URL filtering policy to amplify and reflect traffic toward a victim.
Business
Service availability is degraded or lost as the organization's network infrastructure becomes an unwitting participant in a distributed denial-of-service attack.
2
Keys to the kingdom — privilege/identity takeover narrative 2
Attacker
I send traffic through the vulnerable PAN-OS instance, which amplifies and reflects it back at scale toward my chosen target.
Business
Network bandwidth and resources are consumed by reflected attack traffic, impacting legitimate business operations and customer access.
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
Coverage & confidence
— what we know, and what we don’tEstablished (cited)
Coverage gaps — stated, not hidden
Disclosure & credit2
Catalogued by palo_altoCNA
Credited with finding itPalo Alto Networks thanks CERT-XLM for reporting this issue.unspecified
Found an error? Propose a correction.
A correction is a cited counter-claim — it must cite a source,
gets reviewed by a second human, and is never auto-applied. See the
correction convention and our identity
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