CVE-2018-16870 — It was found that wolfssl before 3.15.7 is vulnerable to a new variant of the Bleichenbacher attack to perform downgrade attacks against TLS

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MEDIUM

It was found that wolfssl before 3.15.7 is vulnerable to a new variant of the Bleichenbacher attack to perform downgrade attacks against TLS

Published Jan 3, 2019

5.9

MEDIUM

CVSS 3.0

EPSS 1.58%

Description

It was found that wolfssl before 3.15.7 is vulnerable to a new variant of the Bleichenbacher attack to perform downgrade attacks against TLS. This may lead to leakage of sensible data.

Affected products

Vendor n/a Product Wolfssl Default
n/a
- Version
  before 3.15.7
  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

n/a

Wolfssl

n/a

Version	Status	Constraints
before 3.15.7	affected	-

Remediation

No remediation recorded yet.

Metrics

1.58% 0.01585

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.

EPSS probability 0.01585

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 2, 2026	1.58% (0.01585)	74.71th	v5 (v2026.06.15)
Sep 20, 2026	1.58% (0.01585)	74.48th	v5 (v2026.06.15)
Jul 20, 2024	0.15% (0.00151)	51.70th	v3 (v2023.03.01)
May 26, 2024	0.15% (0.00151)	51.21th	v3 (v2023.03.01)
Mar 7, 2023	0.15% (0.00149)	49.20th	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	0.62% (0.00624)	17.80th	v5 (v2026.06.15)
Apr 14, 2021	0.62% (0.00624)	0.00th	v1