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Fencer Vulns
medium 6.5

CVE-2020-18899 json

An uncontrolled memory allocation in DataBufdata(subBox.length-sizeof(box)) function of Exiv2 0.27 allows attackers to cause a denial of se…

published 2021-08-19 5 y ago modified 2026-06-17 4 mo ago also PYSEC-2021-879 , EUVD-2021-0074

cvss
6.5
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.7%
EPSS 1.7% chance of exploitation in 30 days, percentile 76%
public exploits
0
none known

Summary

An uncontrolled memory allocation in DataBufdata(subBox.length-sizeof(box)) function of Exiv2 0.27 allows attackers to cause a denial of service (DOS) via a crafted input.

Patch / fix

  • exiv2 Debian 14, Debian 13, Debian 12 0.27.2-6

debian advisories DEBIAN-CVE-2020-18899

  • exiv2 Ubuntu Pro 16.04 LTS 0.25-2.1ubuntu16.04.7+esm5
  • exiv2 Ubuntu Pro 18.04 LTS 0.25-3.1ubuntu0.18.04.11+esm1

ubuntu advisories UBUNTU-CVE-2020-18899

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

  • exiv2 SLES for SAP 15 SP2, SLES for SAP 15 SP1, SLES for SAP 15 +20 more 0.26-150000.6.16.1

suse advisories SUSE-SU-2022:3598-1

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-2020-18899 updated cvss 6.5

exiv2: uncontrolled memory allocation in DataBufdata may lead to DoS

  • Red Hat Enterprise Linux 6 exiv2, exiv2-libs Red Hat Enterprise Linux 7 exiv2, exiv2-libs, compat-exiv2-023, compat-exiv2-026
    affected: no fix planned “Out of support scope”
  • Red Hat Enterprise Linux 8 exiv2, exiv2-libs, compat-exiv2-026 Red Hat Enterprise Linux 9 exiv2, exiv2-libs
    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
partial
Assessed
2 y ago

Exploit prediction

1.66% chance of exploitation in the next 30 days, higher than 76% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

  • github.com https://github.com/Exiv2/exiv2/issues/742 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by version score vector
CISA ADP 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
CNA 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P
OSV 3.1 6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H

Affected packages

ecosystem package affected fixed in
pypi exiv2
all versions
 no fix listed

Classification

Weakness
  • CWE-770 Allocation of Resources Without Limits or Throttling

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.