No exploitation reportedFix available

CVE-2023-28370

Q: Is CVE-2023-28370 actively exploited?

Active exploitation of CVE-2023-28370 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

Q: What is the CVSS score for CVE-2023-28370?

CVE-2023-28370 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

No exploitation reported by the sources we read.

Published2023-05-25
Fixed in6.3.2
WeaknessCWE-601

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

Open redirect vulnerability in Tornado versions 6.3.1 and earlier allows a remote unauthenticated attacker to redirect a user to an arbitrary web site and conduct a phishing attack by having user access a specially crafted URL.

Timeline

dates in UTC

2023-05-2510:15CVE publishedNVD

Observed activity

isMalicious corpus · updated 2026-10-23 21:37 UTC

Indicators tagged with this CVE, per day0 indicators over 7 days

Block these indicators

Firewall list (EDL, text): https://api.ismalicious.com/edl/cve/CVE-2023-28370?format=txt
CSV export: https://api.ismalicious.com/edl/cve/CVE-2023-28370?format=csv
TAXII collection of exploited CVEs
The EDL and CSV take an API key on the Pro plan.

Versions per branch

NVD · OSV

Tornadoweb tornado

Branch	Affected	Fixed in	Source
6.3	< 6.3.2	6.3.2	NVD · OSV

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

python3-tornadoAlmaLinux:9all versions · fixed in 6.1.0-9.el9

Full record on NVD

Fix

Update Tornadoweb tornado to 6.3.2

Detection

Nuclei template: none so far
Exploit-DB: no entry
Proof-of-concept repositories: none listed

Sources

CISA-ADPSSVC decisionnone2025-01-16
OpenCVESSVC decisionnone—
CISA-ADPCVSS 3.16.12025-01-16
NVDCVSS 3.16.1read 2026-10-23
CISA-ADPweakness (CWE)CWE-6012025-01-16
NVDweakness (CWE)CWE-601read 2026-10-23
FIRST EPSSEPSS score1.1 %2026-10-23
OSVaffected packages—

Technical details

CVSS v3 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Published: 2023-05-25
Last Modified: 2026-06-17
NVD status: Modified

Frequently asked questions

What is CVE-2023-28370?

Is CVE-2023-28370 actively exploited?

Active exploitation of CVE-2023-28370 has not been confirmed. Its EPSS score was 1.1% on 2026-10-23, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2023-28370?

CVE-2023-28370 has a CVSS v3 base score of 6.1 (MEDIUM severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

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