CVE-2020-5249

Exploitation

Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.

SSVC decision

Not assessed by CISA

EPSS probability

1.57% probability of exploitation activity in the next 30 days.

EPSS percentile

Equal to or higher than the score of 74.8% of scored records. A rank, not a probability.

NVD base score

6.5 (CVSS v3.x), scored by the NVD independently of the CNA.

NVD CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

NVD analysis status

Modified. NVD last modified this record on 2026-06-17.

Red Hat severity

Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

Published

2020-03-02 15:20Z6 YR AGO

Last updated

2024-08-04 08:22Z2 YR AGO

Reserved

2020-01-02

Assigning CNA

GitHub_M

Record state

PUBLISHED

Severity

Medium (CVSS 6.5)

CNA CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L

Weaknesses

• CWE-113Improper Neutralization of CRLF Sequences in HTTP Headers ('HTTP Request/Response Splitting')Variant
• CWE-74Improper Neutralization of Special Elements in Output Used by a Downstream Component ('Injection')Class
• CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')Base

Data version

5.1

Document digest

59efcbd47f64ac5f65998446d40dd5c1b9c68fe8a2fb2cb59b5a42d104fd3d74

• owasp.orghttps://owasp.org/www-community/attacks/HTTP_Response_Splittingx_refsource_MISC
• github.comhttps://github.com/puma/puma/security/advisories/GHSA-33vf-4xgg-9r58x_refsource_CONFIRM
• github.comhttps://github.com/puma/puma/security/advisories/GHSA-84j7-475p-hp8vx_refsource_MISC
• github.comhttps://github.com/puma/puma/commit/c22712fc93284a45a93f9ad7023888f3a65524f3x_refsource_MISC
• lists.fedoraproject.orgFEDORA-2020-a3f26a9387https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NJ3LL5F5QADB6LM46GXZETREAKZMQNRD/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2020-fd87f90634https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/BMJ3CGZ3DLBJ5WUUKMI5ZFXFJQMXJZIK/vendor-advisoryx_refsource_FEDORA
• lists.fedoraproject.orgFEDORA-2020-08092b4c97https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/DIHVO3CQMU7BZC7FCTSRJ33YDNS3GFPK/vendor-advisoryx_refsource_FEDORA