7.5

CVE-2021-21339: Cleartext storage of session identifier

Modified
Published 23-03-2021Last modified 03-08-2024

Vulnerability summary

CVE-2021-21339 is a high (CVSS 7.5) vulnerability in typo3. EPSS estimates a 0.92% chance of exploitation in the next 30 days, higher than 60.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.9, network access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
0.92%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 23-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

TYPO3 is an open source PHP based web content management system. In TYPO3 before versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1 user session identifiers were stored in cleartext - without processing of additional cryptographic hashing algorithms. This vulnerability cannot be exploited directly and occurs in combination with a chained attack - like for instance SQL injection in any other component of the system. This is fixed in versions 6.2.57, 7.6.51, 8.7.40, 9.5.25, 10.4.14, 11.1.1.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.92%

Chance of exploitation in the next 30 days

Percentile

60%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.92% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Typo32 products
  • typo3≥ 6.2.0, < 6.2.57 | ≥ 7.0.0, < 7.6.51 | ≥ 8.0.0, < 8.7.40 | ≥ 9.0.0, < 9.5.25 | ≥ 10.0.0, < 10.4.14 | ≥ 11.0.0, < 11.1.1
  • typo3.cms≥ 6.2.0, ≤ 6.2.56 | ≥ 7.0.0, ≤ 7.6.50 | ≥ 8.0.0, ≤ 8.7.39 | ≥ 9.0.0, ≤ 9.5.24 | ≥ 10.0.0, ≤ 10.4.13 | ≥ 11.0.0, ≤ 11.1.0

1 vendor · 2 products

References

3 links