How severe is CVE-2015-4016?

CVE-2015-4016 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2015-4016 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2015-4016?

CVE-2015-4016 affects Valvesoftware Steam Client. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2015-4016?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2015-4016 published?

CVE-2015-4016 was published on 2015-05-20 and last updated on 2026-06-17.

CVE-2015-4016

CVE-2015-4016 is a medium-severity vulnerability in Valvesoftware Steam Client with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-20.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (87th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-20
Affected product: Valvesoftware Steam Client
Published: 2015-05-20
Last modified: 2026-06-17

Description

The client detection protocol in Valve Steam allows remote attackers to cause a denial of service (process crash) via a crafted response to a broadcast packet.

Frequently asked questions

What is CVE-2015-4016?: The client detection protocol in Valve Steam allows remote attackers to cause a denial of service (process crash) via a crafted response to a broadcast packet.
How severe is CVE-2015-4016?: CVE-2015-4016 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2015-4016 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (87th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2015-4016?: CVE-2015-4016 affects Valvesoftware Steam Client. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2015-4016?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2015-4016 published?: CVE-2015-4016 was published on 2015-05-20 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:valvesoftware:steam_client:*:*:*:*:*:*:*:*

More vulnerabilities in Valvesoftware Steam Client

CVE-2021-30481 — High (CVSS 8.0): Valve Steam before 2021-04-17, when a Source engine game is installed, allows remote authenticated users to execute…
CVE-2020-15530 — High (CVSS 7.8): An issue was discovered in Valve Steam Client 2.10.91.91. The installer allows local users to gain NT AUTHORITY\SYSTEM…
CVE-2019-17180 — High (CVSS 7.8): Valve Steam Client before 2019-09-12 allows placing or appending partially controlled filesystem content, as…
CVE-2019-15315 — High (CVSS 7.8): Valve Steam Client for Windows through 2019-08-16 allows privilege escalation (to NT AUTHORITY\SYSTEM) because local…
CVE-2015-7985 — High (CVSS 7.2): Valve Steam 2.10.91.91 uses weak permissions (Users: read and write) for the Install folder, which allows local users…
CVE-2019-15316 — High (CVSS 7.0): Valve Steam Client for Windows through 2019-08-20 has weak folder permissions, leading to privilege escalation (to NT…

All CVEs affecting Valvesoftware Steam Client →

Other CWE-20 (Improper Input Validation) vulnerabilities

CVE-2026-93952 — Critical (CVSS 10.0): VeloCloud Orchestrator (VCO) on-prem has a security issue where this issue may allow a remote attacker to access…
CVE-2026-77554 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi…
CVE-2026-77537 — Critical (CVSS 10.0): A malicious actor with access to the network could exploit an Improper Input Validation vulnerability found in UniFi…
CVE-2026-48056 — Critical (CVSS 10.0): Streambert is a cross-platform Electron Desktop App to stream and download video content. Versions prior to 2.5.0…
CVE-2026-33267 — Critical (CVSS 10.0): Improper Input Validation vulnerability in Apache Traffic Server. This issue affects Apache Traffic Server: from 9.2.0…
CVE-2026-47668 — Critical (CVSS 10.0): DbGate is cross-platform database manager. In versions 7.1.8 and prior, DbGate's JSON script runner (`POST…

Browse all CWE-20 (Improper Input Validation) vulnerabilities →