7.5

CVE-2021-27577: apache software foundation apache traffic server HTTP Request/Response Smuggling

CVSS: 7.5v3.1HighModified
AliasesUBUNTU-CVE-2021-27577DEBIAN-CVE-2021-27577
Published 29-06-2021Last modified 03-08-2024
Open JSON

Vulnerability summary

CVE-2021-27577 is a high (CVSS 7.5) HTTP Request/Response Smuggling vulnerability in apache software foundation apache traffic server. EPSS estimates a 3.45% chance of exploitation in the next 30 days, higher than 88.8% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
3.45%
0%100%
Low · -0.10 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
DSA-4957-1

Timeline

  1. 29-06-2021
    PublishedVulnerability first disclosed.
  2. 03-08-2024
    Last modifiedVulnerability information updated.

Description

Incorrect handling of url fragment vulnerability of Apache Traffic Server allows an attacker to poison the cache. This issue affects Apache Traffic Server 7.0.0 to 7.1.12, 8.0.0 to 8.1.1, 9.0.0 to 9.0.1.

CVSS metrics

4 scores · 3 sources · 2 versions

EPSS trend

Probability

3.45%

Chance of exploitation in the next 30 days

Percentile

89%

Versus all other CVEs

30-day change

-0.10 pp

From 3.54% on 18-09-2026

18-09-202618-10-2026
EPSS score
3.45%

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

Debian2 products
Apache1 product
  • traffic_server≥ 7.0.0, ≤ 7.1.12 | ≥ 8.0.0, ≤ 8.1.1 | ≥ 9.0.0, ≤ 9.0.1
Apache software foundation1 product
Ubuntu1 product
  • trafficserverAll versions (No fix recorded)

4 vendors · 5 products

References

9 links