CVE-2019-9503

HIGHNVD 7.98.3▲
EchelonGraph scoreMEDIUM confidence

Score 8.3 from GitHub Security Advisory (severity: HIGH) published 2022-05-24. NVD baseline CVSS 7.9; sources differ by 0.4.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
8.3EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 3.3%CVSS: 7.9Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the is_wlc_event_frame function will cause this frame to be discarded and unprocessed. If the driver receives the firmware event frame from the host, the appropriate handler is called. This frame validation can be bypassed if the bus used is USB (for instance by a wifi dongle). This can allow firmware event frames from a remote source to be processed. In the worst case scenario, by sending specially-crafted WiFi packets, a remote, unauthenticated attacker may be able to execute arbitrary code on a vulnerable system. More typically, this vulnerability will result in denial-of-service conditions.

CVSS v3
7.9
EG Score
8.3HIGHmedium confidence
EG Risk
43
EG Risk 43/100CISA 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
Severity83% × 45%
Exploitation3% × 40%
Automatability30% × 15%
CISA SSVC: Track at low or medium mission impact; Track or Attend at high (mission-essential systems).
Action: A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.
EPSS PROB
3.3%
EPSS %ILE
88th
KEV
Not listed

CISA SSVCTrack at low or medium mission impact; Track or Attend at high (mission-essential systems).

A fix is available. Apply it within your standard update timelines at low or medium mission impact and sooner than that at high.

Exploitation none (no KEV listing, exploit record or EPSS ≥ 50%) · Automatable unknown (not published for this CVE) · Technical impact partial (CVSS below 9.0). 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

January 16, 2020

Last Modified

November 21, 2024

Advisory Details (7)

Auto-updated Sep 21, 2026
🔬 Proof of concept available. Patch available. Sources: cert, redhat.
generic

Making sure you're not a bot!

https://bugzilla.suse.com/show_bug.cgi?id=1132828
redhatMentions a patch (unverified)

1701842 – (CVE-2019-9503) CVE-2019-9503 kernel: brcmfmac frame validation bypass

Affected: Red Hat Enterprise Linux 8

https://bugzilla.redhat.com/show_bug.cgi?id=1701842
generic🟡 PoC Available

Reverse-engineering Broadcom wireless chipsets - Quarkslab's blog

https://blog.quarkslab.com/reverse-engineering-broadcom-wireless-chipsets.html
generic

CVE-2019-9503

https://security-tracker.debian.org/tracker/CVE-2019-9503
generic

CVE-2019-9503 | Ubuntu

https://people.canonical.com/~ubuntu-security/cve/2019/CVE-2019-9503.html
cert

VU#166939 - Broadcom WiFi chipset drivers contain multiple vulnerabilities

https://kb.cert.org/vuls/id/166939/
generic

brcmfmac: add subtype check for event handling in data path - kernel/git/torvalds/linux.git - Linux kernel source tree

https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a4176ec356c73a46c07c181c6d04039fafa34a9f

Vendor Advisories for CVE-2019-9503(3)

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

Patch Availability(12)

Vendor / EcosystemFix (by version range) / PatchReleasedSource
ubuntulinux-image-virtual-hwe-16.04-edge (4.15.0.50.52) @ bionic2026-05-27ubuntu
ubuntulinux-image-4.18.0-1012-kvm (4.18.0-1012.12) @ cosmic2026-05-27ubuntu
ubuntulinux-image-virtual-hwe-16.04 (4.15.0.50.71) @ xenial2026-05-27ubuntu
ubuntulinux-image-virtual-lts-xenial (4.4.0.157.165) @ xenial2026-05-27ubuntu
ubuntulinux-image-virtual-lts-xenial (4.4.0.159.167) @ xenial2026-05-27ubuntu
ubuntulinux-image-virtual-hwe-18.04 (4.18.0.20.70) @ bionic2026-05-27ubuntu
ubuntulinux-image-5.0.0-1006-azure (5.0.0-1006.6) @ disco2026-05-27ubuntu
redhatkernel-0:3.10.0-1062.26.1.el72020-06-11redhat
redhatkernel-rt-0:3.10.0-1127.rt56.1093.el72020-03-31redhat
redhatkernel-0:3.10.0-1127.el72020-03-31redhat
redhatkernel-0:4.18.0-80.11.1.el8_02019-09-12redhat
redhatkernel-rt-0:4.18.0-80.11.1.rt9.156.el8_02019-09-12redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(7 across 6 ecosystems)
Debian:8(2)
PackageVulnerable rangeFix by version rangeDependents
linux3.16.36-1 ... 3.16.7-ckt9-3~deb8u1~bpo70+1 (63 versions)
  • every version up to 3.16.68-1: fixed in 3.16.68-1
—
linux-4.94.9.110-1~deb8u1, 4.9.144-3.1~deb8u1, 4.9.168-1~deb8u1
  • every version up to 4.9.168-1+deb9u3~deb8u1: fixed in 4.9.168-1+deb9u3~deb8u1
—
Debian:11(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.19.37-4: fixed in 4.19.37-4
—
Debian:12(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.19.37-4: fixed in 4.19.37-4
—
Debian:13(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.19.37-4: fixed in 4.19.37-4
—
Debian:14(1)
PackageVulnerable rangeFix by version rangeDependents
linux—
  • every version up to 4.19.37-4: fixed in 4.19.37-4
—
Debian:9(1)
PackageVulnerable rangeFix by version rangeDependents
linux4.9.107-1 ... 4.9.88-1~bpo8+1 (48 versions)
  • every version up to 4.9.168-1+deb9u3: fixed in 4.9.168-1+deb9u3
—

Weakness Classification(1)

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

Additional Vendor Advisories

(9)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 5× in last 7d / 26× 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 158 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-04 23:18 UTCEPSS rescore
  3. 2026-10-03 14:22 UTCEPSS rescore
  4. 2026-09-30 14:59 UTCEPSS rescore
  5. 2026-09-30 10:30 UTCEG score recompute
  6. 2026-09-28 13:46 UTCEPSS rescore
  7. 2026-09-27 13:40 UTCEPSS rescore
  8. 2026-09-27 11:07 UTCOSV refresh
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  24. 2026-09-07 20:48 UTCOSV refresh
  25. 2026-09-07 15:57 UTCEPSS rescore
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  1. 2026-09-06 13:44 UTCEPSS rescore
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  9. 2026-08-25 13:45 UTCEPSS rescore
  10. 2026-08-21 06:14 UTCOSV refresh
  11. 2026-08-19 17:00 UTCEPSS rescore
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  19. 2026-08-05 20:54 UTCOSV refresh
  20. 2026-08-05 19:13 UTCEPSS rescore
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  31. 2026-07-24 14:14 UTCEPSS rescore
  32. 2026-07-23 14:15 UTCEPSS rescore
  33. 2026-07-23 01:47 UTCEG score recompute
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  35. 2026-07-22 14:05 UTCEPSS rescore
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  39. 2026-07-19 21:18 UTCOSV refresh
  40. 2026-07-19 14:28 UTCEPSS rescore
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  64. 2026-07-02 12:02 UTCOSV refresh
  65. 2026-07-01 15:03 UTCEPSS rescore
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  73. 2026-06-25 13:47 UTCEPSS rescore
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  75. 2026-06-24 14:03 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-9503?
CVE-2019-9503 is a high vulnerability published on January 16, 2020. The Broadcom brcmfmac WiFi driver prior to commit a4176ec356c73a46c07c181c6d04039fafa34a9f is vulnerable to a frame validation bypass. If the brcmfmac driver receives a firmware event frame from a remote source, the iswlcevent_frame function will cause this frame to be discarded and unprocessed. If…
When was CVE-2019-9503 disclosed?
CVE-2019-9503 was first published on January 16, 2020, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2019-9503 actively exploited?
CVE-2019-9503 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 3.3% probability of exploitation in the next 30 days (88th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-9503?
CVE-2019-9503 has a CVSS v3 base score of 7.9 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 8.3 (HIGH).
How do I remediate CVE-2019-9503?
A fix for CVE-2019-9503 is available: update to the fixed version the vendor names in its advisory. The vendor advisories EchelonGraph has for CVE-2019-9503 are linked in the Vendor Advisories panel on this page.

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