7.5

CVE-2020-1888: facebook hhvm Out-of-bounds Read

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2020-1888
Published 03-03-2020Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2020-1888 is a high (CVSS 7.5) Out-of-bounds Read vulnerability in facebook hhvm. EPSS estimates a 1.15% chance of exploitation in the next 30 days, higher than 66.4% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.15%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Timeline

  1. 03-03-2020
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Insufficient boundary checks when decoding JSON in handleBackslash reads out of bounds memory, potentially leading to DOS. This issue affects HHVM 4.45.0, 4.44.0, 4.43.0, 4.42.0, 4.41.0, 4.40.0, 4.39.0, versions between 4.33.0 and 4.38.0 (inclusive), versions between 4.9.0 and 4.32.0 (inclusive), and versions prior to 4.8.7.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.15%

Chance of exploitation in the next 30 days

Percentile

66%

Versus all other CVEs

30-day change

0.00 pp

From 1.15% on 21-09-2026

21-09-202621-10-2026
EPSS score
1.15%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Facebook1 product
  • hhvm4.45.1 | 4.44.1 | 4.43.1 | 4.42.1 | 4.41.1 | 4.40.1 | 4.39.1 | 4.38.1 | ≥ 4.33.0, < unspecified | 4.32.1 | ≥ 4.9.0, < unspecified | 4.8.7 | ≥ unspecified, ≤ 4.8.6 | < 4.8.7 | ≥ 4.9.0, ≤ 4.32.0 | ≥ 4.33.0, ≤ 4.38.0 | 4.39.0 | 4.40.0 | 4.41.0 | 4.42.0 | 4.43.0 | 4.44.0 | 4.45.0
Ubuntu1 product
  • hhvmAll versions (No fix recorded)

2 vendors · 2 products

References

4 links