9.8

CVE-2019-3557: facebook hhvm Out-of-bounds Read

CVSS: 9.8v3.0CriticalModified
AliasesUBUNTU-CVE-2019-3557
Published 15-01-2019Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2019-3557 is a critical (CVSS 9.8) Out-of-bounds Read vulnerability in facebook hhvm. EPSS estimates a 1.71% chance of exploitation in the next 30 days, higher than 77% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.0 (NVD)
EPSS score
1.71%
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. 15-01-2019
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

The implementations of streams for bz2 and php://output improperly implemented their readImpl functions, returning -1 consistently. This behavior caused some stream functions, such as stream_get_line, to trigger an out-of-bounds read when operating on such malformed streams. The implementations were updated to return valid values consistently. This affects all supported versions of HHVM (3.30 and 3.27.4 and below).

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.71%

Chance of exploitation in the next 30 days

Percentile

77%

Versus all other CVEs

30-day change

0.00 pp

From 1.71% on 20-09-2026

20-09-202620-10-2026
EPSS score
1.71%

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
  • hhvm3.30.1 | ≥ 3.30.0, < unspecified | 3.27.5 | ≥ unspecified, < 3.27.5 | ≤ 3.27.4 | ≥ 3.28.0, ≤ 3.30.0
Ubuntu1 product
  • hhvmAll versions (No fix recorded)

2 vendors · 2 products

References

4 links