CVE-2018-6347 — An issue in the Proxygen handling of HTTP2 parsing of headers/trailers can lead to a denial-of-service attack

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HIGH

An issue in the Proxygen handling of HTTP2 parsing of headers/trailers can lead to a denial-of-service attack

Published Dec 31, 2018

7.5

HIGH

CVSS 3.1

EPSS 1.37%

Description

An issue in the Proxygen handling of HTTP2 parsing of headers/trailers can lead to a denial-of-service attack. This affects Proxygen prior to v2018.12.31.00.

Affected products

Vendor Facebook Product Proxygen Default
n/a
- Version
  unspecified
  Status
  affected
  Constraints
  <=v2018.12.31.00
- Version
  v2018.12.31.00
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Facebook

Proxygen

n/a

Version	Status	Constraints
unspecified	affected	<=v2018.12.31.00
v2018.12.31.00	affected	-

Remediation

No remediation recorded yet.

Metrics

1.37% 0.01370

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.01370

Score over time

2021–2026

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Percentile over time

EPSS v1
EPSS v5
EPSS v2
EPSS v3

Table of values (9 key points)

Flat stretches are collapsed; showing up to 120 newest points.

Date	Score	Percentile	Model
Oct 1, 2026	1.37% (0.01370)	70.92th	v5 (v2026.06.15)
Sep 20, 2026	1.37% (0.01370)	70.69th	v5 (v2026.06.15)
Jul 20, 2024	0.14% (0.00142)	50.48th	v3 (v2023.03.01)
Jun 20, 2024	0.14% (0.00142)	50.22th	v3 (v2023.03.01)
Mar 7, 2023	0.14% (0.00142)	48.21th	v3 (v2023.03.01)
Mar 6, 2023	0.89% (0.00885)	27.89th	v2 (v2022.01.01)
Feb 4, 2022	0.89% (0.00885)	10.50th	v2 (v2022.01.01)
Feb 3, 2022	0.42% (0.00416)	10.04th	v5 (v2026.06.15)
Apr 14, 2021	0.42% (0.00416)	0.00th	v1