NVD / CVE Program· CNA mitre

CVE-2020-36193: Tar.php in Archive_Tar through 1.4.11 allows write operations with Directory Traversal due to inadequate checking of symbolic links, a…

HighCVSS 7.5 · v3.1KEVWeaponized Fix available

Noroxi assessment

Priority: Now (action score 81/100)

CISA has confirmed exploitation in the wild (Aug 25, 2022). Remediation deadline for US federal agencies: Sep 15, 2022.
Probability of exploitation in the next 30 days: 70.5% (FIRST EPSS); higher than 99.4% of all records.
Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
According to CISA the attack is automatable: targets can be found by mass scanning.
Fixed version: apcu-panel (AlmaLinux:8) 5.1.18-1.module_el8.6.0+2750+78feabcb; libzip (AlmaLinux:8) 1.6.1-1.module_el8.6.0+2750+78feabcb, 1.6.1-1.module_el8.6.0+3239+bedf0508; libzip-devel (AlmaLinux:8) 1.6.1-1.module_el8.6.0+3239+bedf0508, 1.6.1-1.module_el8.6.0+2750+78feabcb.

Patch today or shut off access. Upgrade to apcu-panel (AlmaLinux:8) 5.1.18-1.module_el8.6.0+2750+78feabcb; libzip (AlmaLinux:8) 1.6.1-1.module_el8.6.0+2750+78feabcb, 1.6.1-1.module_el8.6.0+3239+bedf0508; libzip-devel (AlmaLinux:8) 1.6.1-1.module_el8.6.0+3239+bedf0508, 1.6.1-1.module_el8.6.0+2750+78feabcb or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · CISA KEV · FIRST EPSS

Tar.php in Archive_Tar through 1.4.11 allows write operations with Directory Traversal due to inadequate checking of symbolic links, a related issue to CVE-2020-28948.

Published: Jan 18, 2021
Updated: Jun 16, 2026
EPSS: 70.5% · 99th percentile
CWE: CWE-22

Report tools

JSON

Action score

Now

Patch today or shut off access.

CVSS: 30 / 40 · 7.5 / 10
CISA KEV: 30 / 30 · Listed
EPSS: 21 / 30 · 70.5%

CISA SSVC decision

Exploitation: active
Automatable: yes
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

Actively exploited in the wild

CISA added this to its Known Exploited Vulnerabilities catalog on Aug 25, 2022. That signals real attacks, not theory.

Remediation deadline for US federal agencies: Sep 15, 2022.

Get told when this record changes

In CISA KEV: exploitation in the wild confirmed
Weaponized exploit exists
A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Is your version affected? Check it

Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

Vendor	Product	CPE
php	archive tar	cpe:2.3:a:php:archive_tar
fedoraproject	fedora	cpe:2.3:o:fedoraproject:fedora
debian	debian linux	cpe:2.3:o:debian:debian_linux
drupal	drupal	cpe:2.3:a:drupal:drupal

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

debian debian linux10.0
debian debian linux9.0
drupal drupal9.1.0 and later · before 9.1.3
drupal drupal7.0 and later · before 7.78
drupal drupal8.9.0 and later · before 8.9.13
drupal drupal9.0.0 and later · before 9.0.11
fedoraproject fedora32
fedoraproject fedora33

+3 more rows

fedoraproject fedora34
fedoraproject fedora35
php archive tarup to 1.4.11 inclusive

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

+96

Same product

php: all records

Other highest-scoring records for the same primary product.

CVE-2020-28949Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as…KEV
86Now
CVE-2021-32610In Archive_Tar before 1.4.14, symlinks can refer to targets outside of the extracted archive, a different vulnerability than CVE-2020-36193.
50Plan
CVE-2020-28948Archive_Tar through 1.4.10 allows an unserialization attack because phar: is blocked but PHAR: is not blocked.
45Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
almalinux:apcu-panel	5.1.18-1.module_el8.6.0+2750+78feabcb · AlmaLinux:8	Package registry (OSV)
almalinux:libzip	1.6.1-1.module_el8.6.0+2750+78feabcb · AlmaLinux:8	Package registry (OSV)
almalinux:libzip-devel	1.6.1-1.module_el8.6.0+2750+78feabcb · AlmaLinux:8	Package registry (OSV)
almalinux:libzip-tools	1.6.1-1.module_el8.6.0+3239+bedf0508 · AlmaLinux:8	Package registry (OSV)
almalinux:php	7.4.19-4.module_el8.6.0+3238+624bf8b8 · AlmaLinux:8	Package registry (OSV)
almalinux:php-bcmath	7.4.19-4.module_el8.6.0+3238+624bf8b8 · AlmaLinux:8	Package registry (OSV)
almalinux:php-cli	7.4.19-4.module_el8.6.0+3239+bedf0508 · AlmaLinux:8	Package registry (OSV)
almalinux:php-common	7.4.19-4.module_el8.6.0+3239+bedf0508 · AlmaLinux:8	Package registry (OSV)
almalinux:php-dba	7.4.19-4.module_el8.6.0+3238+624bf8b8 · AlmaLinux:8	Package registry (OSV)
almalinux:php-dbg	7.4.19-4.module_el8.6.0+3238+624bf8b8 · AlmaLinux:8	Package registry (OSV)
almalinux:php-devel	7.4.19-4.module_el8.6.0+3238+624bf8b8 · AlmaLinux:8	Package registry (OSV)
almalinux:php-embedded	7.4.19-4.module_el8.6.0+3239+bedf0508 · AlmaLinux:8	Package registry (OSV)
alpine:drupal7	7.78-r0 · Alpine:v3.12	Package registry (OSV)
debian:drupal7	7.52-2+deb9u14 · Debian:9	Package registry (OSV)
debian:php-pear	1:1.10.12+submodules+notgz+20210212-1 · Debian:12	Package registry (OSV)
opensuse:php7	7.2.5-4.82.1 · openSUSE:Leap 15.3	Package registry (OSV)
opensuse:php7-pear	1.10.21-lp152.2.6.1 · openSUSE:Leap 15.2	Package registry (OSV)
Packagist:pear/archive_tar	1.4.13	Package registry (OSV)
red hat:apcu-panel	0:5.1.18-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:libzip	0:1.6.1-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:libzip-debuginfo	0:1.6.1-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:libzip-debugsource	0:1.6.1-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:libzip-devel	0:1.6.1-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:libzip-tools	0:1.6.1-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:libzip-tools-debuginfo	0:1.6.1-1.module+el8.3.0+6678+b09f589e · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:php	0:7.4.6-5.module+el8.4.0+15727+276bb227 · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:php-bcmath	0:7.4.6-5.module+el8.4.0+15727+276bb227 · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:php-bcmath-debuginfo	0:7.4.6-5.module+el8.4.0+15727+276bb227 · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:php-cli	0:7.4.6-5.module+el8.4.0+15727+276bb227 · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)
red hat:php-cli-debuginfo	0:7.4.6-5.module+el8.4.0+15727+276bb227 · Red Hat:rhel_eus:8.4::appstream	Package registry (OSV)

+10

Exploit status

Weaponized

A ready exploit tool or active in-the-wild use is known for this vulnerability. This should be your top priority.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

PublishedJan 18, 2021
CISA KEVAug 25, 2022+583 d
TodayNov 14, 2026+2125 d

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

pear/Archive_Tarcommit cde4605

Not on record for this CVE: EPSS history · researcher credit · variant or chain candidate · public bounty program.

Technical details

Attack conditions

Anyone who can reach it over the internet can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: high · data or configuration can be modified
Availability: none

Attack vector: Network
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: High
Availability impact: None

Weakness class (CWE)

CWE-22 · Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

CVSS vector

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

nvd-primary

Root cause

A user-supplied file name is joined with the allowed directory, but the result is never checked to confirm it is still inside that directory.

The bug in code

The whole CWE-22 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1const file = path.join(ROOT, req.query.name);
2res.sendFile(file);

Fixed

1const file = path.resolve(ROOT, req.query.name);
2if (!file.startsWith(ROOT + path.sep)) {
3  return res.sendStatus(400);
4}
5res.sendFile(file);

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

Attack patterns (CAPEC)

ATT&CK techniques

—

Change log (1)

Fix✗ → ✓Sep 28, 2026, 10:45 PM UTC

For records you follow, these changes also arrive as notifications. →

References

github.com/pear/Archive_Tar/commit/cde460582ff389404b5b3ccb59374e9b389de916

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records

Ecosystem	Package	Affected range	Fix
AlmaLinux:8	apcu-panel	before 5.1.18-1.module_el8.6.0+2750+78feabcb	5.1.18-1.module_el8.6.0+2750+78feabcb
AlmaLinux:8	libzip	before 1.6.1-1.module_el8.6.0+2750+78feabcb	1.6.1-1.module_el8.6.0+2750+78feabcb
AlmaLinux:8	libzip	before 1.6.1-1.module_el8.6.0+3239+bedf0508	1.6.1-1.module_el8.6.0+3239+bedf0508
AlmaLinux:8	libzip-devel	before 1.6.1-1.module_el8.6.0+3239+bedf0508	1.6.1-1.module_el8.6.0+3239+bedf0508
AlmaLinux:8	libzip-devel	before 1.6.1-1.module_el8.6.0+2750+78feabcb	1.6.1-1.module_el8.6.0+2750+78feabcb
AlmaLinux:8	libzip-tools	before 1.6.1-1.module_el8.6.0+3239+bedf0508	1.6.1-1.module_el8.6.0+3239+bedf0508
AlmaLinux:8	libzip-tools	before 1.6.1-1.module_el8.6.0+2750+78feabcb	1.6.1-1.module_el8.6.0+2750+78feabcb
AlmaLinux:8	php	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-bcmath	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-bcmath	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-cli	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-cli	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-common	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-common	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-dba	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-dba	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-dbg	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-dbg	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-devel	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-devel	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-embedded	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508
AlmaLinux:8	php-embedded	before 7.4.19-4.module_el8.6.0+3238+624bf8b8	7.4.19-4.module_el8.6.0+3238+624bf8b8
AlmaLinux:8	php-enchant	before 7.4.19-4.module_el8.6.0+3239+bedf0508	7.4.19-4.module_el8.6.0+3239+bedf0508