CVE-2022-0028

CRITICALNVD 8.69.0▲
EchelonGraph scoreHIGH confidence

Score elevated to 9.0 because this CVE is listed on the CISA Known Exploited Vulnerabilities catalog (added 2022-08-22), indicating real-world exploitation has been confirmed by US federal agencies. NVD baseline CVSS 8.6 retained for reference. Confidence: HIGH.

Triggered by: CISA KEV (actively exploited)
Sources: cisa_kev, epss, ghsa, nvd
Trending — 3 sources updated this weekExploited in the wild
9.0EG
EchelonGraph verdictMitigate nowTreat as an emergency — this is being exploited.
  • 1 internet-facing service (distinct ip:port) on record running an affected version — derived from Shodan data (© Shodan); a patched service can stay counted while its port stays open
  • Actively exploited in the wild (CISA-KEV)
CISA-KEV: ExploitedEPSS PROB: 2.5%CVSS: 8.6Exploit: cisa kev · ssvc activeExposed services: 1

No fix is confirmed yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for the fix.

A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container) firewall against an attacker-specified target. To be misused by an external attacker, the firewall configuration must have a URL filtering profile with one or more blocked categories assigned to a source zone that has an external facing interface. This configuration is not typical for URL filtering and, if set, is likely unintended by the administrator. If exploited, this issue would not impact the confidentiality, integrity, or availability of our products. However, the resulting denial-of-service (DoS) attack may help obfuscate the identity of the attacker and implicate the firewall as the source of the attack. We have taken prompt action to address this issue in our PAN-OS software. All software updates for this issue are expected to be released no later than the week of August 15, 2022. This issue does not impact Panorama M-Series or Panorama virtual appliances. This issue has been resolved for all Cloud NGFW and Prisma Access customers and no additional action is required from them.

Internet exposure · derived from Shodan data

1 internet-facing service (distinct ip:port) on record running a version that maps to CVE-2022-0028, in our KEV-Exposure radar’s Shodan-derived sample.

across 1 countries (United States)top: pan-os
See the KEV-Exposure radar →Derived from Shodan data. Shodan data is owned by Shodan, which holds its copyright (© Shodan). EchelonGraph claims no ownership of it or copyright in it. Aggregate, host-redacted.

How it counts: every 12 hours, when Shodan query credits allow, the radar runs one Shodan query per tracked product, reads up to 100 ip:port services per query, and keeps a service when its banner version matches a CISA-KEV or high-EPSS CVE; a service is dropped when neither a search nor a Shodan InternetDB port re-check has refreshed it for 21 days. A re-check that finds the port still listed by Shodan InternetDB refreshes the service without re-reading the banner, so a patched service can stay counted while its port stays open. A count is a banner-version inference over a sample, not an exploit test and not an internet-wide census, and the unit is a service, not a machine: a machine answering on two ports counts twice.

CVSS v3
8.6
EG Score
9.0CRITICALhigh confidence
EG Risk
96
EG Risk 96/100CISA SSVC

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity90% × 45%
Exploitation100% × 40%
Automatability100% × 15%
CISA SSVC: Attend at low or medium mission impact; Act at high (mission-essential systems).
Action: No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low or medium mission impact and as soon as possible at high, and watch the vendor's advisory for the fix.
EPSS PROB
2.5%
EPSS %ILE
84th
KEV
⚠ Exploited

CISA SSVCAttend at low or medium mission impact; Act at high (mission-essential systems).

No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation sooner than your standard update timelines at low or medium mission impact and as soon as possible at high, and watch the vendor's advisory for the fix.

Exploitation active (CISA Vulnrichment) · Automatable yes (CISA Vulnrichment) · Technical impact partial (CISA Vulnrichment). Mission impact is CISA's Mission & Well-being decision point, and only you can judge it: high means the affected system is essential to your organisation's mission, or its compromise could cause irreversible harm to people. CISA's decision table

Published

August 10, 2022

Last Modified

November 4, 2025

Advisory Details (2)

Auto-updated Jun 2, 2026
⚠️ Active exploitation confirmed. No fix on record yet. Sources: cisa.
cisa🔴 Active Exploitation

Known Exploited Vulnerabilities Catalog | CISA

Known Exploited Vulnerabilities Catalog | CISA. Listed in CISA Known Exploited Vulnerabilities catalog.

https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2022-0028
generic

CVE-2022-0028 PAN-OS: Reflected Amplification Denial-of-Service (DoS) Vulnerability in URL Filtering

https://security.paloaltonetworks.com/CVE-2022-0028

Vendor Advisories for CVE-2022-0028(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(2)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 56× in last 7d / 248× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 1,066 total refreshes for this CVE.

  1. 2026-10-09 20:40 UTCEG score recompute
  2. 2026-10-09 20:40 UTCGHSA enrichment
  3. 2026-10-09 20:04 UTCEPSS rescore
  4. 2026-10-09 16:33 UTCGHSA enrichment
  5. 2026-10-09 12:27 UTCGHSA enrichment
  6. 2026-10-09 08:20 UTCGHSA enrichment
  7. 2026-10-09 04:14 UTCGHSA enrichment
  8. 2026-10-09 00:07 UTCGHSA enrichment
  9. 2026-10-08 20:01 UTCEG score recompute
  10. 2026-10-08 20:01 UTCGHSA enrichment
  11. 2026-10-08 16:40 UTCEPSS rescore
  12. 2026-10-08 15:52 UTCGHSA enrichment
  13. 2026-10-08 11:46 UTCGHSA enrichment
  14. 2026-10-08 07:40 UTCGHSA enrichment
  15. 2026-10-08 03:33 UTCEG score recompute
  16. 2026-10-08 03:33 UTCGHSA enrichment
  17. 2026-10-07 23:45 UTCEPSS rescore
  18. 2026-10-07 23:26 UTCGHSA enrichment
  19. 2026-10-07 19:20 UTCGHSA enrichment
  20. 2026-10-07 15:14 UTCGHSA enrichment
  21. 2026-10-07 11:08 UTCGHSA enrichment
  22. 2026-10-07 07:01 UTCGHSA enrichment
  23. 2026-10-07 02:54 UTCGHSA enrichment
  24. 2026-10-06 22:47 UTCGHSA enrichment
  25. 2026-10-06 18:41 UTCEG score recompute
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  1. 2026-10-06 18:41 UTCGHSA enrichment
  2. 2026-10-06 15:14 UTCEPSS rescore
  3. 2026-10-06 14:34 UTCGHSA enrichment
  4. 2026-10-06 10:27 UTCGHSA enrichment
  5. 2026-10-06 06:21 UTCGHSA enrichment
  6. 2026-10-06 02:14 UTCGHSA enrichment
  7. 2026-10-05 22:07 UTCGHSA enrichment
  8. 2026-10-05 18:01 UTCEG score recompute
  9. 2026-10-05 18:01 UTCGHSA enrichment
  10. 2026-10-05 17:40 UTCEPSS rescore
  11. 2026-10-05 13:55 UTCGHSA enrichment
  12. 2026-10-05 09:48 UTCGHSA enrichment
  13. 2026-10-05 05:42 UTCGHSA enrichment
  14. 2026-10-05 01:35 UTCEG score recompute
  15. 2026-10-05 01:35 UTCGHSA enrichment
  16. 2026-10-04 23:19 UTCEPSS rescore
  17. 2026-10-04 21:29 UTCGHSA enrichment
  18. 2026-10-04 17:22 UTCGHSA enrichment
  19. 2026-10-04 13:16 UTCGHSA enrichment
  20. 2026-10-04 09:09 UTCGHSA enrichment
  21. 2026-10-04 05:03 UTCGHSA enrichment
  22. 2026-10-04 00:57 UTCGHSA enrichment
  23. 2026-10-03 20:50 UTCGHSA enrichment
  24. 2026-10-03 16:44 UTCEG score recompute
  25. 2026-10-03 16:44 UTCGHSA enrichment
  26. 2026-10-03 14:22 UTCEPSS rescore
  27. 2026-10-03 14:22 UTCEPSS rescore
  28. 2026-10-03 12:38 UTCGHSA enrichment
  29. 2026-10-03 08:31 UTCGHSA enrichment
  30. 2026-10-03 04:24 UTCGHSA enrichment
  31. 2026-10-03 00:17 UTCGHSA enrichment
  32. 2026-10-02 20:10 UTCEG score recompute
  33. 2026-10-02 20:10 UTCGHSA enrichment
  34. 2026-10-02 16:23 UTCEPSS rescore
  35. 2026-10-02 16:02 UTCGHSA enrichment
  36. 2026-10-02 11:54 UTCGHSA enrichment
  37. 2026-10-02 07:47 UTCGHSA enrichment
  38. 2026-10-02 03:40 UTCGHSA enrichment
  39. 2026-10-01 23:33 UTCEG score recompute
  40. 2026-10-01 23:33 UTCGHSA enrichment
  41. 2026-10-01 19:23 UTCGHSA enrichment
  42. 2026-10-01 15:16 UTCGHSA enrichment
  43. 2026-10-01 11:09 UTCGHSA enrichment
  44. 2026-10-01 07:03 UTCGHSA enrichment
  45. 2026-10-01 02:56 UTCGHSA enrichment
  46. 2026-09-30 22:49 UTCGHSA enrichment
  47. 2026-09-30 18:43 UTCEG score recompute
  48. 2026-09-30 18:43 UTCGHSA enrichment
  49. 2026-09-30 15:00 UTCEPSS rescore
  50. 2026-09-30 14:36 UTCGHSA enrichment
  51. 2026-09-30 10:29 UTCGHSA enrichment
  52. 2026-09-30 06:21 UTCGHSA enrichment
  53. 2026-09-30 02:15 UTCGHSA enrichment
  54. 2026-09-29 22:07 UTCGHSA enrichment
  55. 2026-09-29 18:00 UTCEG score recompute
  56. 2026-09-29 17:59 UTCGHSA enrichment
  57. 2026-09-29 15:15 UTCEPSS rescore
  58. 2026-09-29 13:51 UTCGHSA enrichment
  59. 2026-09-29 09:44 UTCGHSA enrichment
  60. 2026-09-29 05:38 UTCGHSA enrichment
  61. 2026-09-29 01:31 UTCEG score recompute
  62. 2026-09-29 01:31 UTCGHSA enrichment
  63. 2026-09-28 21:25 UTCGHSA enrichment
  64. 2026-09-28 17:19 UTCEG score recompute
  65. 2026-09-28 17:18 UTCGHSA enrichment
  66. 2026-09-28 13:47 UTCEPSS rescore
  67. 2026-09-28 13:12 UTCGHSA enrichment
  68. 2026-09-28 09:05 UTCGHSA enrichment
  69. 2026-09-28 04:58 UTCGHSA enrichment
  70. 2026-09-28 00:52 UTCGHSA enrichment
  71. 2026-09-27 21:51 UTCCISA KEV update
  72. 2026-09-27 20:45 UTCGHSA enrichment
  73. 2026-09-27 16:38 UTCEG score recompute
  74. 2026-09-27 16:38 UTCGHSA enrichment
  75. 2026-09-27 12:32 UTCGHSA enrichment

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Frequently asked(6)

What is CVE-2022-0028?
CVE-2022-0028 is a critical vulnerability published on August 10, 2022. A PAN-OS URL filtering policy misconfiguration could allow a network-based attacker to conduct reflected and amplified TCP denial-of-service (RDoS) attacks. The DoS attack would appear to originate from a Palo Alto Networks PA-Series (hardware), VM-Series (virtual) and CN-Series (container)…
When was CVE-2022-0028 disclosed?
CVE-2022-0028 was first published on August 10, 2022, with the most recent update on November 4, 2025. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2022-0028 actively exploited?
Yes. CISA added CVE-2022-0028 to the Known Exploited Vulnerabilities catalog on August 22, 2022, affecting Palo Alto Networks PAN-OS. KEV listing indicates confirmed exploitation in the wild; this CVE warrants immediate attention. No fix is confirmed yet. Restrict network exposure of the affected system or apply the vendor's mitigation, and watch the vendor's advisory for the fix.
What is the CVSS score of CVE-2022-0028?
CVE-2022-0028 has a CVSS v3 base score of 8.6 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 9.0 (CRITICAL).
Which products are affected by CVE-2022-0028?
CVE-2022-0028 affects Palo Alto Networks PAN-OS.
How do I remediate CVE-2022-0028?
No fix for CVE-2022-0028 is confirmed yet. Until one is published, restrict network exposure of the affected system or apply the vendor's mitigation — for example, keep it off the internet or limit it to trusted networks — and watch the vendor's advisory for the fix. The vendor advisories EchelonGraph has for CVE-2022-0028 are linked in the Vendor Advisories panel on this page.

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