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Fencer Vulns
high 7.8

CVE-2023-43620 json

Croc sender may place ANSI or CSI escape sequences in filename to attach receiver's terminal device

published 2023-09-20 3 y ago modified 2026-09-10 1 mo ago also GHSA-364c-vvqx-446c , GO-2023-2068 , EUVD-2023-2400

cvss
7.8
version 3.1, NVD
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

An issue was discovered in Croc through 9.6.5. A sender may place ANSI or CSI escape sequences in a filename to attack the terminal device of a receiver.

Patch / fix

  • 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-2023-43620

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

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-2023-43620 updated cvss 8.3

croc: ANSI or CSI escape sequences in filenames can be used attack the receiver's terminal.

  • 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
no
Technical impact
total
Assessed
2 y ago

Exploit prediction

0.36% chance of exploitation in the next 30 days, higher than 30% 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
  • github.com https://github.com/schollz/croc/issues/595 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
GitHub 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

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-116 Improper Encoding or Escaping of Output

References

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.