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Vulnerabilities

Vulnerability · CVE-2017-20205

Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function copies characters from an input strin

Published Oct 15, 2025 · catalog updated Nov 21, 2025 · Valve Software Source SDK (source-sdk-2013)

Last checked Oct 25, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2017-20205. EPSS is 0.69%. Act only if a listed version of Valve Software Source SDK (source-sdk-2013) is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Critical9.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.69%
Remediation
Advisory link
Affected products
vendor Valve Software Source SDK (source-sdk-2013) source-sdk-2013

Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function copies characters from an input string into a fixed-size stack buffer without performing bounds checks. When processes a collisionpair rule longer than the destination buffer (256 bytes), an overflow of the stack buffer can occur and overwrite the function return address. A remote attacker can trigger the vulnerable code by supplying a specially crafted ragdoll model which causes the oversized collisionpair rule to be parsed, resulting in remote code ex

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor Valve Software Source SDK (source-sdk-2013) source-sdk-2013source-sdk-2013

How to fix CVE-2017-20205

  • No stored fix

    No vendor fix text is stored. Use the linked advisory before you change production.

  • Version check

    No version range is stored, so an installed version cannot be checked on this page.

  • Advisory

    Open the cve_org record and follow its fix.

  • Official advisories

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2017-20205. EPSS is 0.69%. Act only if a listed version of Valve Software Source SDK (source-sdk-2013) is installed.

Which versions are affected?

Compare what you have installed with Valve Software Source SDK (source-sdk-2013) source-sdk-2013 source-sdk-2013. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.69%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 15, 2025 · EUVD

    Detected

    Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function copies characters from an input string into a fixed-size stack buffer without performing bounds checks. When processes a collisionpair rule longer than the destination buffer (256 bytes), an overflow of the stack buffer can occur and overwrite the function

  2. Nov 21, 2025 · EUVD

    Updated

    Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function copies characters from an input string into a fixed-size stack buffer without performing bounds checks. When processes a collisionpair rule longer than the destination buffer (256 bytes), an overflow of the stack buffer can occur and overwrite the function

Sources

  • CVE.orgVulnerability recordCVE-2017-20205

    Official CVE identifier

    cve.org
  • EUVDVulnerability recordEUVD-2017-18920

    Valve's Source SDK (source-sdk-2013)'s ragdoll model parsing logic contains a stack-based buffer overflow vulnerability.The tokenizer function copies characters from an input string into a fixed-size stack buffer without performing bounds checks. When processes a collisionpair ru

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 25, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CVE.orgOct 25, 2026
  • EUVDOct 25, 2026