7.5

CVE-2021-20213: privoxy NULL Pointer Dereference

CVSS: 7.5v3.1HighModified
AliasesALPINE-CVE-2021-20213UBUNTU-CVE-2021-20213DEBIAN-CVE-2021-20213
Published 25-03-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-20213 is a high (CVSS 7.5) NULL Pointer Dereference vulnerability in privoxy. EPSS estimates a 1.57% chance of exploitation in the next 30 days, higher than 75% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.57%
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 2 · Related 1
DLA-2548-1USN-4886-1

Timeline

  1. 25-03-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

A flaw was found in Privoxy in versions before 3.0.29. Dereference of a NULL-pointer that could result in a crash if accept-intercepted-requests was enabled, Privoxy failed to get the request destination from the Host header and a memory allocation failed.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

1.57%

Chance of exploitation in the next 30 days

Percentile

75%

Versus all other CVEs

30-day change

0.00 pp

From 1.57% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.57%

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

Alpine1 product
  • privoxy< 3.0.29-r0
Debian1 product
  • privoxy< 3.0.29-1
Privoxy1 product
Ubuntu1 product
  • privoxy< 3.0.21-7+deb8u1ubuntu0.1~esm1 | < 3.0.24-1ubuntu0.1 | < 3.0.26-5ubuntu0.1 | < 3.0.28-2ubuntu0.1

4 vendors · 4 products

References

10 links