Croc requires senders to provide local IP addresses in cleartext

published 2023-09-20 3 y ago modified 2026-09-10 1 mo ago also GHSA-7mp6-929p-pqhj , GO-2023-2070 , EUVD-2023-2458

cvss: 5.3; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.5%; EPSS 0.5% chance of exploitation in 30 days, percentile 42%
public exploits: 0; none known

An issue was discovered in Croc through 9.6.5. The protocol requires a sender to provide its local IP addresses in cleartext via an ips? message.

Patch / fix

fixed in 1 distros 1 links 2

go github.com/schollz/croc/v9 9.6.16

croc Alpine 3.24, Alpine 3.23, Alpine 3.22 10.0.11-r0

alpine advisories ALPINE-CVE-2023-43618

Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

github.com/schollz/croc@6f5f16a commit
github.com/schollz/croc#700 pull request

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2023-43618 updated 2026-01-13 cvss 4.3

croc: rotocol requires a sender to provide its local IP addresses in cleartext

Red Hat All currently supported Red Hat products
not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation: Proof of concept is public
Automatable: yes
Technical impact: partial
Assessed: 2 y ago (2024-09-25)

Exploit prediction

0.49% chance of exploitation in the next 30 days, higher than 42% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

openwall.com https://www.openwall.com/lists/oss-security/2023/09/08/2 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
NVD	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub	3.1	5.3	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

Affected packages

ecosystem	package	affected	fixed in
go	github.com/schollz/croc/v9	<9.6.16	9.6.16
go	github.com/schollz/croc	all versions	no fix listed
go	github.com/schollz/croc/v6	all versions	no fix listed
go	github.com/schollz/croc/v8	all versions	no fix listed

Classification

Weakness

CWE-311 Missing Encryption of Sensitive Data

References

github.com /schollz/croc/pull/700
web, patch
github.com /schollz/croc/commit/6f5f16aa1c16b1ec6f31fec35be15de466d9701b
web, patch
openwall.com /lists/oss-security/2023/09/08/2
web, exploit, mailing-list, third-party-advisory
github.com /schollz/croc/issues/597
web, issue-tracking, third-party-advisory, report
openwall.com /lists/oss-security/2023/09/21/5
mailing-list, web
nvd.nist.gov /vuln/detail/CVE-2023-43618
advisory
github.com /schollz/croc
package
github.com /advisories/GHSA-7mp6-929p-pqhj
advisory

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary