CVE-2019-11940

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.4% (70th percentile of EPSS-scored CVEs). GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1.4%CVSS: 9.8Exploit: None knownExposed services: Not assessed

A fix is available — apply it.

In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.

CVSS v3
9.8
EG Score
9.8CRITICALmedium confidence
EG Risk
49
EG Risk 49/100CISA 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
Severity98% × 45%
Exploitation1% × 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
1.4%
EPSS %ILE
70th
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 total (CVSS ≥ 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

December 4, 2019

Last Modified

November 21, 2024

Advisory Details (2)

Auto-updated Oct 5, 2026
Patch available. Sources: github_commit.
generic

Facebook

https://www.facebook.com/security/advisories/cve-2019-11940
github_commit Patch Available

commit f43b134cc5c1 (facebook/proxygen)

Patch available: facebook/proxygen v2026.03.02.00 (contains commit f43b134cc5c1)

https://github.com/facebook/proxygen/commit/f43b134cc5c19d8532e7fb670a1c02e85f7a8d4f

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 4× in last 7d / 24× 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 160 total refreshes for this CVE.

  1. 2026-10-05 17:39 UTCEPSS rescore
  2. 2026-10-03 14:21 UTCEPSS rescore
  3. 2026-09-30 14:59 UTCEPSS rescore
  4. 2026-09-30 10:09 UTCEG score recompute
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  1. 2026-09-04 13:56 UTCEPSS rescore
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  41. 2026-07-23 01:39 UTCEG score recompute
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  46. 2026-07-20 17:04 UTCEPSS rescore
  47. 2026-07-20 00:48 UTCOSV refresh
  48. 2026-07-19 14:28 UTCEPSS rescore
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  70. 2026-07-01 15:03 UTCEPSS rescore
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  72. 2026-06-30 23:20 UTCEPSS rescore
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  74. 2026-06-29 14:03 UTCEPSS rescore
  75. 2026-06-28 14:04 UTCEPSS rescore

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Frequently asked(5)

What is CVE-2019-11940?
CVE-2019-11940 is a critical vulnerability published on December 4, 2019. In the course of decompressing HPACK inside the HTTP2 protocol, an unexpected sequence of header table resize operations can place the header table into a corrupted state, leading to a use-after-free condition and undefined behavior. This issue affects Proxygen from v0.29.0 until v2017.04.03.00.
When was CVE-2019-11940 disclosed?
CVE-2019-11940 was first published on December 4, 2019, 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-2019-11940 actively exploited?
CVE-2019-11940 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1.4% probability of exploitation in the next 30 days (70th percentile of EPSS-scored CVEs).
What is the CVSS score of CVE-2019-11940?
CVE-2019-11940 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2019-11940?
A fix for CVE-2019-11940 is available: update to the fixed version the vendor names in its advisory.

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