CVE-2021-21300

mediumpriority · attend · 71EPSS 0.885 · 100 %ileexploit · weaponizedDEEURUUS

grimoire priorityP1 · Urgent

Exploitable?

Public exploit

15 exploits · weaponized

Likely / severe?

88.5% (100th) EPSS

CVSS 5.1 · medium

Is it mine?

48 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · fstec_bdu · phoenix_contact_psirt

EPSS · scored 2026-10-27

Git is an open-source distributed revision control system. In affected versions of Git a specially crafted repository that contains symbolic links as well as files using a clean/smudge filter such as Git LFS, may cause just-checked out script to be executed while cloning onto a case-insensitive file system such as NTFS, HFS+ or APFS (i.e. the default file systems on Windows and macOS). Note that clean/smudge filters have to be configured for that. Git for Windows configures Git LFS by default, and is therefore vulnerable. The problem has been patched in the versions published on Tuesday, March 9th, 2021. As a workaound, if symbolic link support is disabled in Git (e.g. via `git config --global core.symlinks false`), the described attack won't work. Likewise, if no clean/smudge filters such as Git LFS are configured globally (i.e. _before_ cloning), the attack is foiled. As always, it is best to avoid cloning repositories from untrusted sources. The earliest impacted version is 2.14.2. The fix versions are: 2.30.1, 2.29.3, 2.28.1, 2.27.1, 2.26.3, 2.25.5, 2.24.4, 2.23.4, 2.22.5, 2.21.4, 2.20.5, 2.19.6, 2.18.5, 2.17.62.17.6.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

Fixedphoenix_contact_psirt
**Update to Firmware Release 2022.0.3 LTS or higher:** - AXC F 2152 (2404267) [Download](http://www.phoenixcontact.net/qr/2404267/firmware) - AXC F 1152 (1151412) [Download](http://www.phoenixcontact.net/qr/1151412/firmware) - AXC F 3152 (1069208) Not yet released **Update to PLCnext Engineer Release 2022.0.1 LTS or higher.**
Mitigationphoenix_contact_psirt
Phoenix Contact recommends operating network-capable devices in closed networks or protected with a suitable firewall. For detailed information on our recommendations for measures to protect network-capable devices, please refer to our application note: Measures to protect network-capable devices with Ethernet connection

cvss

Technical severity, 0–10. One row per scoring source.

8.0

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5.1–8

v2.05.1mediumAV:N/AC:H/Au:N/C:P/I:P/A:Pprimary · NVD / NIST USexploitability 4.9 · impact 6.4

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hprimary · NVD / NIST USexploitability 1.6 · impact 5.9

v3.18highAV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:Hsecondary · FSTEC (BDU) RU

v3.18highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:Nsecondary · ENISA EU

v3.18highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:Nsecondary · security-advisories@github.comexploitability 1.6 · impact 5.8

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Phoenix Contact PSIRT DE

v3.17.5highCVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H/E:Hsecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-59USprimaryCWE-59USCWE-94US

exploits (15)

Public proof-of-concept and weaponised exploit code.

exploit/multi/http/git_lfs_clone_command_execGit LFS Clone Command Execweaponized · metasploit
1uanWu/CVE-2021-21300remote code exec for gitPoC · poc_in_github
AlkenePan/CVE-2021-21300AlkenePan/CVE-2021-21300PoC · poc_in_github
ETOCheney/cve-2021-21300ETOCheney/cve-2021-21300PoC · poc_in_github
Faisal78123/CVE-2021-21300Faisal78123/CVE-2021-21300PoC · poc_in_github
Kirill89/CVE-2021-21300Kirill89/CVE-2021-21300PoC · poc_in_github

affected products (48)

Products and version ranges known to be affected.

git Git2.14.2, → 2.17.62.17.6enisa_euvdEU
git Git2.18.0, → 2.18.5enisa_euvdEU
git Git2.19.0, → 2.19.6enisa_euvdEU
git Git2.20.0, → 2.20.5enisa_euvdEU
git Git2.21.0, → 2.21.4enisa_euvdEU
git Git2.22.0, → 2.22.5enisa_euvdEU
git Git2.23.0, → 2.23.4enisa_euvdEU
git Git2.24.0, → 2.24.4enisa_euvdEU
git Git2.25.0, → 2.25.5enisa_euvdEU
git Git2.26.0, → 2.26.3enisa_euvdEU
git Git2.27.0, → 2.27.1enisa_euvdEU
git Git2.28.0, → 2.28.1enisa_euvdEU
git Git2.29.0, → 2.29.3enisa_euvdEU
git Git2.30.0, → 2.30.1enisa_euvdEU
Microsoft Corp Microsoft Visual Studio 201715.0 → 15.8fstec_bduRU
Microsoft Corp Microsoft Visual Studio 201916.0 → 16.7fstec_bduRU
Microsoft Corp Microsoft Visual Studio 201916.0 → 16.3fstec_bduRU
Microsoft Corp Microsoft Visual Studio 201916.0 → 16.6fstec_bduRU
Microsoft Corp Microsoft Visual Studio 201916.0 → 16.8fstec_bduRU
ООО «РусБИТех-Астра» Astra Linux Special Edition≤ 1.6 «Смоленск»fstec_bduRU

showing 20 of 48

advisories (1)

Vendor and ecosystem advisories describing this.

VDE-2022-010PHOENIX CONTACT: Multiple Linux component vulnerabilities fixed in latest AXC F x152 LTS release2022-04-12csaf · phoenix_contact_psirtDE
PLCnext Control AXC F x152 is certified according to IEC 62443-4-1 and IEC 62443-4-2. This certification requires that all third-party components used in the firmware are regularly checked for known vulnerabilities. Firmware components in version 2021.06 had already been updated. For the 2022.0 LTS version more firmware components have been updated implicitly fixing the vulnerabilities listed. The vulnerabilities listed above have not been individually verified in terms of actual impact and/or limitations in combination with the affected products listed. The current LTS release 2022.0 LTS contains updates of integrated third-party libraries, SDKs and other third-party software to address these issues nevertheless. UPDATE A (April 4th, 2022): Added RFC 4072 (Art. No. 1051328) and fixed affected version of AXC F 3152

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd fstec_bdu phoenix_contact_psirt NVD CVE.org MITRE

published 2021-03-09modified 2026-06-17

related (2,372)

Related entries.

ID	severity	EPSS	exploitable	published
CVE-2026-81963US	high7.8OT critical	0.39% (33rd)	KEV	2026-09-08
Improper link resolution before file access ('link following') in Windows Update Stack allows an authorized attacker to elevate privileges locally.
CVE-2026-41091US	—OT critical	8.20% (95th)	KEV	2026-05-20
Improper link resolution before file access ('link following') in Microsoft Defender allows an authorized attacker to elevate privileges locally.
CVE-2025-60710US	—OT critical	4.61% (92nd)	KEV	2025-11-11
Improper link resolution before file access ('link following') in Host Process for Windows Tasks allows an authorized attacker to elevate privileges locally.
CVE-2025-48384US	—OT critical	4.38% (91st)	KEV	2025-07-08
Git is a fast, scalable, distributed revision control system with an unusually rich command set that provides both high-level operations and full access to internals. When reading…
CVE-2025-21391US	—OT critical	2.28% (83rd)	KEV	2025-02-11
Windows Storage Elevation of Privilege Vulnerability

+2367 more

references (57)

External citations — patches, advisories, analysis.

scry

Attackers weaponise vulnerabilities like this against internet-exposed services. See what is exposed on your perimeter with a free passive scan.

Free scan