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CVE-2021-23772

22
FAUCET Score

CVE-2021-23772 is a high-severity vulnerability affecting all versions of the "github.com/kataras/iris" and "github.com/kataras/iris/v12" Go packages. It allows authenticated attackers to write files to arbitrary locations outside the intended upload directory due to unsafe handling of filenames during the UploadFormFiles method. With a CVSS score of 8.8, this vulnerability poses a significant risk of high impact to confidentiality, integrity, and availability. There is currently no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 12.1.8CPE matchmatch criteria
cpe:2.3:a:iris-go:iris:*:*:*:*:*:go:*:*
12.2.0CPE matchmatch criteria
cpe:2.3:a:iris-go:iris:12.2.0:alpha:*:*:*:go:*:*
12.2.0CPE matchmatch criteria
cpe:2.3:a:iris-go:iris:12.2.0:alpha2:*:*:*:go:*:*
12.2.0CPE matchmatch criteria
cpe:2.3:a:iris-go:iris:12.2.0:alpha3:*:*:*:go:*:*
12.2.0CPE matchmatch criteria
cpe:2.3:a:iris-go:iris:12.2.0:alpha4:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
1.6
Impact Score
5.9
CvssVersion
3.1

Exploit Intelligence

EPSS Score
1.82%
Probability of exploitation in next 30 days
EPSS Percentile
76.5%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0182 is in the 75th percentile among its peer group of 17,823 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
gopatch availablevia ghsa
Product: github.com/kataras/iris/v12Fixed in: 12.2.0-alpha8

Vendor Advisories (2)

goGHSA-jcxc-rh6w-wf49high

Link Following in Iris

Jan 6, 2022
redhatCVE-2021-23772Moderate

kataras/iris: unsafe handling of file names during upload using UploadFormFiles method may allow attackers to write to arbitrary locations outside the designated target folder

Dec 23, 2021

References

github.com / kataras/iris/commit/e213dba0d32ff66653e0ef124bc5088817264b08
PatchThird Party Advisory
snyk.io / vuln/SNYK-GOLANG-GITHUBCOMKATARASIRIS-2325169
ExploitPatchThird Party Advisory
snyk.io / vuln/SNYK-GOLANG-GITHUBCOMKATARASIRISV12-2325170
ExploitPatchThird Party Advisory