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Threats / Palo Alto Networks / CVE-2022-0028
CVE-2022-0028 · EUVD no mirror located · GCVE no mirror located Verified 2026-06-22

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 · 2022-08-223EPSS 0.02025 (verify live)4
01

Is it exploitable?

— the evidence, ranked above the score
Reported 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.
security.paloaltonetwork ↗cisa.gov ↗isc.sans.edu ↗Confirmed
Exploited in the wild
Listed in the CISA Known Exploited Vulnerabilities catalog (added 2022-08-22).
CISA KEV ↗Confirmed
Probability (EPSS)
EPSS 0.02025 — modeled likelihood of exploitation activity.EPSS is a daily-changing model output — open the source for today's value.
FIRST EPSS ↗High
Severity / affected
Affected: Palo Alto Networks, PAN-OS. Confirm exact fixed builds in the vendor advisory.
NVD ↗Reported
Weakness (CWE)
Mapped to CWE-940 Improper Source Verification — weakness family: Authentication.CWE assignment from the public NVD record; the weakness class drives how the flaw is exploited.
NVD ↗Reported
WeaknessCWE-940 · Improper Source VerificationAuthentication
02

Who’s exploiting it?

— attribution turns risk into urgency
Attribution 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 board
1

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’t

Established (cited)

  • KEV listing (CISA)
  • EPSS probability (FIRST)
  • 3 reported-exploitation source(s)
  • CWE weakness mapping (NVD)
  • Catalogued by palo_alto (CNA)
  • Named finder/reporter credit (CVE.org)

    • Coverage gaps — stated, not hidden

  • No EUVD / GCVE mirror in feed — single-authority dependency for the identifier.
  • EPSS & exposure are time-varying; verify live at the source.
  • Threat-actor attribution not established from feed data — absence of a name is not absence of compromise.
    • Disclosure & credit2
    Catalogued by palo_altoCNA
    Credited with finding itPalo Alto Networks thanks CERT-XLM for reporting this issue.unspecified