6.5

CVE-2021-41270: fedoraproject fedora

CVSS: 6.5v3.1MediumModified
AliasesUBUNTU-CVE-2021-41270DEBIAN-CVE-2021-41270
Published 24-11-2021Last modified 04-08-2024
Open JSON

Vulnerability summary

CVE-2021-41270 is a medium (CVSS 6.5) vulnerability in fedoraproject fedora. EPSS estimates a 1.40% chance of exploitation in the next 30 days, higher than 72% of scored vulnerabilities.

Overall risk
26/100
0100
Medium · default modelHow is this calculated?
CVSS score
6.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
1.40%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 1 · Related 1
USN-5290-1

Timeline

  1. 24-11-2021
    PublishedVulnerability first disclosed.
  2. 04-08-2024
    Last modifiedVulnerability information updated.

Description

Symfony/Serializer handles serializing and deserializing data structures for Symfony, a PHP framework for web and console applications and a set of reusable PHP components. Symfony versions 4.1.0 before 4.4.35 and versions 5.0.0 before 5.3.12 are vulnerable to CSV injection, also known as formula injection. In Symfony 4.1, maintainers added the opt-in `csv_escape_formulas` option in the `CsvEncoder`, to prefix all cells starting with `=`, `+`, `-` or `@` with a tab `\t`. Since then, OWASP added 2 chars in that list: Tab (0x09) and Carriage return (0x0D). This makes the previous prefix char (Tab `\t`) part of the vulnerable characters, and OWASP suggests using the single quote `'` for prefixing the value. Starting with versions 4.4.34 and 5.3.12, Symfony now follows the OWASP recommendations and uses the single quote `'` to prefix formulas and add the prefix to cells starting by `\t`, `\r` as well as `=`, `+`, `-` and `@`.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.40%

Chance of exploitation in the next 30 days

Percentile

72%

Versus all other CVEs

30-day change

0.00 pp

From 1.40% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.40%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Debian1 product
  • symfony< 4.4.19+dfsg-3
Fedoraproject1 product
Sensiolabs1 product
  • symfony≥ 4.1.0, < 4.4.35 | ≥ 5.0.0, < 5.3.12
Symfony1 product
  • symfony≥ 4.1.0, < 4.4.35 | ≥ 5.0.0, < 5.3.12
Ubuntu1 product
  • symfony< 4.3.8+dfsg-1ubuntu1+esm1

5 vendors · 5 products

References

10 links