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Fencer Vulns
high 7.8

CVE-2020-28949 kev in the critical feed json

Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as fi…

published 2020-11-19 5 y ago modified 2026-06-17 4 mo ago also EUVD-2021-0783

cvss
7.8
version 3.1, CNA
cisa kev
Exploited
added 2022-08-25
epss
84.6%
EPSS 84.6% chance of exploitation in 30 days, percentile 99.7%
public exploits
1
Metasploit

Summary

Archive_Tar through 1.4.10 has :// filename sanitization only to address phar attacks, and thus any other stream-wrapper attack (such as file:// to overwrite files) can still succeed.

Patch / fix

cisa required action Apply updates per vendor instructions.

  • php archive_tar 1.4.12
  • drupal drupal 7.75, 8.8.12, 8.9.10, 9.0.9
  • php-pear Debian 14, Debian 13, Debian 12 1:1.10.9+submodules+notgz-1.1

debian advisories DEBIAN-CVE-2020-28949

  • php-pear Ubuntu 16.04 LTS 1:1.10.1+submodules+notgz-6ubuntu0.2
  • php-pear Ubuntu 18.04 LTS 1:1.10.5+submodules+notgz-1ubuntu1.18.04.2
  • php-pear Ubuntu 20.04 LTS 1:1.10.9+submodules+notgz-1ubuntu0.20.04.1
  • drupal7 Ubuntu Pro 14.04 LTS 7.26-1ubuntu0.1+esm2
  • drupal7 Ubuntu Pro 16.04 LTS 7.44-1ubuntu1~16.04.0+esm2

ubuntu advisories UBUNTU-CVE-2020-28949

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • php-pear RHEL 7 1:1.9.4-23.el7_9
  • libzip RHEL 8, RHEL 8.4 EUS 1.6.1-1.module+el8.3.0+6678+b09f589e
  • php RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-gd RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-cli RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-dba RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-dbg RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d
  • php-ffi RHEL 8 7.4.19-4.module+el8.6.0+16316+906f6c6d

red hat advisories RHSA-2022:7340RHSA-2022:6541RHSA-2022:6542

  • php AlmaLinux 8 7.4.19-4.module_el8.6.0+3238+624bf8b8
  • php AlmaLinux 8 7.4.19-4.module_el8.6.0+3239+bedf0508
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+2750+78feabcb
  • libzip AlmaLinux 8 1.6.1-1.module_el8.6.0+3239+bedf0508
  • php-gd AlmaLinux 8 7.4.19-4.module_el8.6.0+3238+624bf8b8
  • php-gd AlmaLinux 8 7.4.19-4.module_el8.6.0+3239+bedf0508
  • php-cli AlmaLinux 8 7.4.19-4.module_el8.6.0+3239+bedf0508
  • php-cli AlmaLinux 8 7.4.19-4.module_el8.6.0+3238+624bf8b8

almalinux advisories ALSA-2022:6542

  • php Rocky Linux 8 7.4.19-4.module+el8.6.0+1006+0d5a469f
  • libzip Rocky Linux 8 1.6.1-1.module+el8.6.0+789+2130c178
  • libzip Rocky Linux 8 1.6.1-1.module+el8.4.0+415+e936cba3
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.7.0+1067+0a7071cc
  • php-pear Rocky Linux 8 1:1.10.13-1.module+el8.6.0+1006+0d5a469f
  • php-pecl-rrd Rocky Linux 8 2.0.1-1.module+el8.4.0+414+2e7afcdd
  • php-pecl-zip Rocky Linux 8 1.18.2-1.module+el8.6.0+789+2130c178
  • php-pecl-zip Rocky Linux 8 1.18.2-1.module+el8.4.0+415+e936cba3

rocky linux advisories RLSA-2022:6542

  • drupal7 Alpine 3.20, Alpine 3.19, Alpine 3.18 +7 more 7.75-r0

alpine advisories ALPINE-CVE-2020-28949

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-2020-28949 updated cvss 7.1

Archive_Tar: improper filename sanitization leads to file overwrites

  • Red Hat Enterprise Linux 6 php-pear
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 php-pear Red Hat Software Collections rh-php73-php-pear
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise Linux AppStream (v. 8) php 7.4.19-4.module+el8.6.0+16316+906f6c6d, libzip 1.6.1-1.module+el8.3.0+6678+b09f589e, php-gd 7.4.19-4.module+el8.6.0+16316+906f6c6d, php-cli 7.4.19-4.module+el8.6.0+16316+906f6c6d, php-dba 7.4.19-4.module+el8.6.0+16316+906f6c6d, php-dbg 7.4.19-4.module+el8.6.0+16316+906f6c6d, +28 more
    fixed: vendor fix RHSA-2022:6542
  • Red Hat Enterprise Linux AppStream EUS (v.8.4) php 7.4.6-5.module+el8.4.0+15727+276bb227, libzip 1.6.1-1.module+el8.3.0+6678+b09f589e, php-gd 7.4.6-5.module+el8.4.0+15727+276bb227, php-cli 7.4.6-5.module+el8.4.0+15727+276bb227, php-dba 7.4.6-5.module+el8.4.0+15727+276bb227, php-dbg 7.4.6-5.module+el8.4.0+15727+276bb227, +28 more
    fixed: vendor fix RHSA-2022:6541
  • Red Hat Enterprise Linux Server (v. 7) php-pear 1.9.4-23.el7_9 Red Hat Enterprise Linux Workstation (v. 7) php-pear 1.9.4-23.el7_9
    fixed: vendor fix RHSA-2022:7340

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

Timeline

  1. First public exploit (Metasploit exploit/multi/fileformat/archive_tar_arb_file_write)
  2. Published
  3. Added to CISA KEV
  4. CISA patch deadline
  5. CISA SSVC: exploitation active

Known exploited

Added
4 y ago
Patch by
2022-09-15 (4 y ago)
Ransomware
Not known
Required action
Apply updates per vendor instructions.
Vendor, product
PEAR, Archive_Tar
CISA name
PEAR Archive_Tar Deserialization of Untrusted Data Vulnerability

CISA SSVC

Exploitation
Active, exploited in the wild
Automatable
no
Technical impact
total
Assessed
21 mo ago

Exploit prediction

84.55% chance of exploitation in the next 30 days, higher than 99.7% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

CVSS scores

assigned by version score vector
CISA ADP 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA 3.1 7.8 CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD 2.0 6.8 AV:N/AC:M/Au:N/C:P/I:P/A:P

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.